Frequently Asked Questions

FAQ – Pressure Washing & General Questions

Power washing, or pressure washing, is the growing application of high pressure water spray. Produced by specially designed pumps, this spray is a hundred times more powerful than the typical garden hose. On concrete it is used to remove unsightly mold, bubble gum, and other dirt stains. Wooden decks are returned to the look of new wood, void of graying and fatigued finishes. And on houses, the appearance of siding (namely aluminum and vinyl) is greatly improved by removing pollution, mildew, and other signs of neglect.

Just to name a few benefits of pressure washing is eliminating mold and mildew, better curb appeal, safety, and increased property value.
St. Louis Pressure Wash uses only cleaning solutions that are eco-friendly, safe, and approved for use in both commercial and residential power washer applications. Our pressure washer chemicals provide sufficient solutions that are safe for your property, plants, pets, and family. Plus they are biodegradable and environmentally friendly.

The majority of our pressure washer chemicals, and other chemicals are environmentally friendly, they achieve great results and save time and money on labor. Pressure Washer approved cleaning solutions are biodegradable, harmless for humans and easy to use.

We only use cleaning solutions that are pressure washer approved. Non-approved cleaning solutions can be harmful for the environment and your property. The chemicals used by St. Louis Pressure Wash are only of the highest quality. Not surprisingly, they are usually the most expensive. This is an area where less professional, lower quality operators in our industry cut corners to make more money or charge less. Don’t be fooled into thinking every pressure washing company is the same. Long-tern results and the safety of your property, your family, and the environment are not worth saving a couple bucks.

Our machines are equipped with downstream injector. We applied apply chemical cleaners under low pressure so that the solution can adhere better to the surface being cleaned. This will allow the formula to react faster and remove the dirt immediately. With our pressure washer cleaning solutions you will get unmatchable results and peace of mind.

Anyone can purchase a pressure washer. Simply owning a pressure washing machine and advertising that you offer a service doesn’t mean you can operate it effectively. A pressure washer in the hands of an unskilled operator can cause a great deal of damage such as damaged, plants and lawn killed, siding blown off, paint peeled from house, and even concrete cut and etched.

Not at all. However, if you won’t be home when we are servicing your property, We do require that you close all windows, clear your driveway or deck of all items such as furniture, grills, planters, etc., and remove any fragile decorations on your home or deck.
Yes. We are very conscious of our impact on the environment. We have specialized equipment that recovers waste water wherever possible so no water will be wasted. And we use only eco-friendly biodegradable cleaning products when pressure washing or soft washing exterior services.

Yes, we need to to have access to water to be able to perform the work.

We have 525 gallon water tanks on board but the water goes a lot quicker than you’d think!.

No. Pressure washing and power washing are the exact same thing, it’s just different terminology, different names for the same thing.
Low maintenance yes, zero maintenance no. Anything left outside in the sun and humidity will get dirty. Your car gets dirty sitting in your driveway, so does your house and deck.

The dark stains you are seeing is mold. All mold needs to grow is moisture (humidity) and a food source and it will grow anywhere. Mold can be removed with low pressure and the right cleaning agents.

Wood turns gray because it is being exposed to water and the sun. In order to prevent your wood from turning gray, stain and seal your deck or fence routinely. Pressure washing should never be used on wood. We always use low-pressure soft washing techniques to clean wood decks, fences and trim.

ABSOLUTELY-NOT! All of our cleaning technicians are trained and certified, and therefore expert in properly caring for our clients’ property. We use only the highest-quality cleaning agents correctly formulated for the specific purpose and material. We use the correct amount of pressure to ensure your property’s protection.

ABSOLUTELY-NOT! We use our soft low pressure method when spraying your house. The tools and techniques, including low pressure and soft washing, used by St. Louis Pressure Wash are more effective cleaning at low pressure than the low cost, less than professional, companies that use more pressure. We use a well thought out technique that both cleans and protects your property.

St. Louis Pressure Wash has spent a considerable amount of time researching and exploring the cleaning agents we use. We only use safe, biodegradable and effective cleaners that will not harm your landscape. And for an extra measure of protection, we thoroughly saturate all vegetation before, during and after the cleaning process.

There is a chance that your windows will need to be properly cleaned after a house wash. When combined with our house washing service, our window cleaning rates are reduced.

Yes, mold and mildew on and around your home create unhealthy conditions for those with asthma and allergies. Through our safe methods in pressure washing and soft washing, we can safely and effectively remove organic growth (mold, mildew) from any exterior surface. This will help keep you and your family safe and healthy. And it safeguards your property from much more costly repairs.

NO! Not even close.

Anyone can purchase a cheap consumer-level pressure washer down at the local Home Depot, get some cheap business cards printed, and start claiming they are a professional pressure washing company. Simply owning a power washer and advertising a service doesn’t mean you can operate it effectively and safely. A pressure washer in the hands of an unskilled operator will do a great deal of harm, this is why professional machines, commercial grade cleaning solvents, and the soft washing processes were created.

Commercial power washing and soft washing equipment are specialized, high quality machines requiring expert training to be operated properly in the multiple applications required on even a single property. If someone is offering “the lowest price” they are cutting corners someplace, whether with equipment, insurance or quality of services. Most often it will be all of the above.

FAQ Pressure Washing Sidewalk Grass St. Louis Pressure Wash
FAQ Soft Washing Patio St. Louis Pressure Wash

FAQ – Soft Washing

Though this isn’t a new technique, Soft-Washing is something you only find with the best Pressure Washing companies in our industry. Yes, we still use a pressure washer, however this method allows us to provide our clientele amazing exterior cleaning results at a lower PSI, or Pounds Per Square Inch. In using this method, it allows us to eliminate any potential for DAMAGE that pressure washing under a high PSI can cause to certain materials such as roofing or siding or wooden decks. The great thing about soft-washing is that it’s absolutely safe and very effective for cleaning any surface that we encounter.

For applications that require soft-washing, as opposed to pressure washing, St. Louis Pressure Wash uses high volume, low pressure applicators to apply a mixture of biodegradable mildewcides, algaecides, and soaps (blended for your particular needs) to safely and effectively remove mold, mildew, algae, moss, and airborne contaminants without damaging your property or plants.

Soft-washing is safe to use on siding materials, like stucco, Dryvit, vinyl, aluminum, EIFS, brick and stone, synthetic or composite decking materials like Trex, painted surfaces, wood, and more. Soft-washing cleans better and uses less water than pressure washing.

When pressure washers or power washers were developed in the last century they were high pressure and designed to BLAST dirt and grime off of a variety of surfaces. This led to surfaces being damaged or destroyed from the high pressure. Since then some things have changed for the better.

Although high pressure machines are still around and very useful when properly used by skilled operators, a variety of Specialized Accessories & Techniques have been developed to create what we are now calling Soft Washing. The process consists of applying a cleaning solution, letting the solution dwell and then rinsing away the unwanted material while using only LOW PRESSURE to insure the safe cleaning of your property.

Lichen, moss, mold, mildew, algae, road grime & dirt don’t stand a chance against Soft Washing. Soft washing kills the growth at the source when compared to using high pressure that only visibly removes the growth not actually killing it at the source.

FAQ – Roof Cleaning

Most black stains on roofs are caused by algae (Gloeocaspa Magma). This is an airborne spore that can land on most any roof, and can actually harm your roof by eating into the limestone that is a component of many shingles today. When it rains, the algae can slowly spread down the roof, adding more stains and streaks. We can not only remove the algae, but help keep it from coming back. Major shingle manufacturers recommend that you clean this algae off — but not to use high pressure washing to do it. Have wood shingles on your house? We can clean those too!

In most cases, you will see the results within minutes but, if the roof has actively growing moss, it could take a couple of weeks for the treatment to penetrate and reach the root system.
Pressure washing not only can damage your shingle, it can VOID your manufactures warranty. Soft Washing uses about as much pressure as a regular garden hose. It is the method approved the Asphalt Roofing Manufacturing Association (ARMA) so it won’t void your warranty, and it is recommended by most of the larger insurance companies as a form of general maintenance.

NEVER! High pressure powerwashing can be very damaging to the shingles. Plus, it’s simply not an effective way to remove algae stains from roofs. All of our roof cleaning equipment is specially calibrated at a very low pressure to ensure a safe and effective washing away of the stains that are released by our proprietary roof cleaning solvents.

When the St. Louis Pressure Wash technicians finish cleaning your roof, it will be as clean as a new roof. Since it’s impossible to tell how long it will take for a new roof to get stained again, the same holds true for a roof cleaned using our proprietary process. However, warranty against any roof staining for a period of one year. That gives you a guarantee that the roof is completely, squeaky clean and no remnants of the stains are left behind.

DIY roof cleaning products sold at stores like Home Depot and Lowes can cause many problems. Many of these low-quality consumer-level products are toxic to the vegetation surrounding your home. Plus, they are largely ineffective in the long term, as well as the short term as far as roof stain removal goes.

Also, whenever homeowners climb up on their roof, they put themselves at risk of slipping and falling. Roof cleaning is serious business and it’s always best to rely on the professionals.

Be very, very careful here. Many homeowners and contractors alike have tried to use bleach or pool chlorine to remove the dark roof staining caused by algae. The results can be disastrous. Bleach and pool chlorine are dangerous chemicals that can damage vegetation, dry out your shingles, and corrode roof fixtures such as flashing, underlayments, valleys, and boots. Any results that the homeowner sees are often just temporary and the staining is back within a few short months because the bleach merely addresses the surface algae and not the root system underneath the granules.

Algae is a living, growing organism and as such, will continue to grow. Left untreated, in time it can cover your entire roof. A roof covered in algae absorbs heat and results in a superheated attic, raising your cooling costs. In addition, since algae feeds off the organic material in your shingles, left untreated, your roof may require costly, premature replacement. Why allow that to happened when you can have your roof professionally cleaned and restored to its original, natural color for a fraction of roof replacement costs?

FAQ Roof Cleaning St. Louis Pressure Wash
FAQ Gutter Cleaning St. Louis Pressure Wash

FAQ – Gutter Cleaning

Your gutters are designed to drain the water from you roof way from your house and foundation. Full gutters and clogged downspouts can lead to roof and gutter damage or leaky basements.
Most homeowners should get their gutters cleaned twice a year. Once obviously after the leaves fall and once again in the spring after bud and seeds have fallen. It takes a relatively small amount of debris to cover or clog a downspout.
The gunk (technical word) in your gutters, especially when wet, is messy. We take the utmost care to make as little mess as possible and clean up any mess that might come from cleaning the gutters. We properly dispose of any debris removed from your gutters so you don’t have to.
The black streaks on your gutters are in the oxidation layer of the paint. The black streaks can be safely removed with low pressure cleaning and special cleaning solutions that St. Louis Pressure Wash uses.
Gutter guards, when professionally installed, are a great investment, reduce maintenance and cleaning of your gutters, and protect your home. After cleaning your gutters, we will be happy to conduct a free review of the viability of gutter guards for your home or commercial property and give you an estimate of the cost.
Yes. Heavy rain or overnight temperatures below freezing can cause a service date to be postponed. In the event of this we will attempt to reach you prior to your scheduled appointment to make other arrangements.

FAQ – Gutter Guard Installation

Absolutely! Many companies manufacture their own version of gutter guards. Some are sold directly to consumers, while others are only sold and installed through certified professional installers, as is the case with St. Louis Pressure Wash.
Through years of experience with a multitude of different types of gutter guards, we have chosen the two best manufacturers of gutter guards that provide the best combination of value, performance, durability, and ease of maintenance. They are Leaf Relief and Shur Flo.
Both Leaf Relief and Shur Flo provide 25 and 20 year manufacturer guarantees, respectively. These guarantees cover manufacturer defects and against debris build-up inside your gutters and traps. (Debris will build-up on top of your gutter guards over time — that is their purpose after all — and will need to be clean periodically. However, this occasional cleaning is far easier than cleaning gutters not protected by gutter guards.)
Yes, but very little compared to cleaning unprotected gutters. Debris will build-up on top of your gutter guards over time — that is their purpose after all — and will need to be clean periodically. However, this occasional cleaning is far easier and less frequent than what is required to clean and maintain gutters not protected by gutter guards.
Absolutely. For example, Leaf Relief for standard gutters is more effective than other types of gutter protection at keeping natural debris such as leaves and twigs from blocking your gutters. Leaf Relief can drain 29.7″ of rainfall an hour —that’s more than the highest rainfall ever recorded, which happened in Holt, Missouri, in 1947 at 12″ in one hour. That’s a lot of rain, my friend.
We have eight different models of gutter guards from which to choose that collectively work on every type of gutter we’ve ever encountered. So, yes.
In nearly every case, the gutter guards will be invisible to anyone on the ground. They are designed to lay flat, recessed slightly down into the gutters, and create a very low profile that blends attractively into the facade of your home.
FAQ Gutter Guard Installation St. Louis Pressure Wash
FAQ Rust Stain Removal St. Louis Pressure Wash

FAQ – Rust Stain Removal

Absolutely. Rust stains from a sprinkler are one of the most common type of rust stains and we deal with those nearly every day.
Yes, rust stains caused by the iron in some fertilizers are the cause of many stained driveways, patios, and sidewalks. Our Concrete Rust Remover works perfectly for those ugly stains.
No. Your grass and landscaping will be completely safe. We use only cleaning solutions that are safe and eco-friendly.

FAQ – Concrete Sealing

Exterior concrete in any region subject to freeze-thaw cycles should be sealed. Many people are surprised to learn that freeze-thaw regions include all of New Mexico, most of Texas, Alabama, Georgia, South Carolina, and even portions of California, Louisiana and Florida. But it definitely includes Missouri.

However, concrete should also be sealed for stain repellence, dust reduction, abrasion resistance, chemical resistance and to maintain an attractive appearance.

Concrete is a porous material that readily absorbs liquids. In freeze-thaw climates, the expansion of frozen liquids can destroy the surface of unsealed concrete. Oil, salt, fertilizer, and other household chemicals can discolor and damage unsealed concrete.

That all depends on the type of sealer that is applied. Most chemically reactive sealers are nearly invisible because they penetrate into the concrete. Solvent-based acrylic resin sealers and epoxies provide significant color enhancement and give concrete a high-gloss wet look. Water-based acrylic resin sealers provide moderate color enhancement and a satin appearance. Urethanes (generally applied as topcoat over epoxy) are available in a wide range of finishes, from matte to gloss. Many sealers can also be colored with translucent or opaque tints.

We will consult with you to determine exactly what type of appearance you want and provide the perfect solution.

Reactive penetrating sealers generally have little effect upon the concrete surface profile or traction. Most topical coatings can affect concrete surface profile, and may require the use of anti-skid additives in areas exposed to foot or vehicle traffic. You can be certain that St. Louis Pressure Wash will use only the most appropriate sealer for your particular situation.

That’s a great question, and in the case of most exterior cleaning and pressure washing companies the answer would be a decisive yes.

However, many years ago when we decided to start offering concrete sealing to our customers, we partnered with Saint Louis Driveway, St. Louis’s leading concrete driveway contractor, to ensure that we were providing the absolute most professional service. We became so good at it that Saint Louis Driveway has since selected us to do the sealing for everuydriveway they install.

Because sealers penetrate the concrete, reactive chemical sealers will last the longest and generally only wear away if the substrate surface itself wears away, which may be 10 years or longer. You can get similar performance with epoxy or urethane sealers, which generally last 5 to 10 years depending on traffic exposure. Acrylic-resin sealers offer the shortest performance life – generally 1 to 3 years. Once again, we will select the best sealer for your particular situation.

Concrete is locally made and can last for many decades with proper care. As sealers extend the useful life of concrete, they are an important component of “green” building and their use can qualify for additional LEED points..

As for the sealer itself, water-based products are generally considered the most environmentally friendly. Some solvent-based sealers can’t be sold in certain states, but new environmentally friendly solvents are now available. St. Louis Pressure Wash only uses the most environmentally friendly sealers, and only ones in full compliance with all state and federal regulations.

FAQ Concrete Sealing St. Louis Pressure Wash
FAQ Commercial Property Exterior Cleaning Services St. Louis Pressure Wash

FAQ – Commercial Property Exterior Cleaning Services

We serve a variety of property types in industries such as commercial, education, healthcare, industrial, retail, property management buildings, shopping malls, parking garages, hotels, shopping centers, restaurants, industrial parks, apartments, resorts, condominiums, town homes, high rises, public pools, warehouses, grocery stores and other specialty industries. To learn more about our services and property types, visit our Commercial Services Page.

While we may not be the least expensive cleaning company around, we are committed to providing high-quality commercial cleaning services at top value. With our high employee retention rate, consistent quality cleaning, commitment to ongoing training, quality assurance procedures, and strong emphasis on communication and accountability, you’ll find that we provide real bang for your buck.

This is a question we get a lot. All situations call for different solutions, so there’s no one right answer. Various factors will determine how quickly your storefront gets dirty. What we know for sure is that a dirty storefront HURTS BUSINESS and will cost you much more money than having it professionally cleaned on a regular schedule. Give us a call and we will determine the right schedule for your store so your business and profits are maximized.

St. Louis Pressure Wash is recognized for its green cleaning programs through its Cleaning Industry Management Standard – Green Building (CIMS – GB) certification. We clean all of our buildings using many green certified chemicals and green cleaning processes.

St. Louis Pressure Wash’s commercial services group specializes in providing regular scheduled maintenance on a timeframe that best suits your needs.

The combination of our professional cleaning expertise and modern pressure washing and surface cleaning equipment consistently deliver outstanding commercial exterior cleaning results for all types of businesses properties.

A clean commercial building exterior speaks volumes about your business. Beyond just looking good, a clean building exterior reflects your company’s stability and success while portraying a solid and professional identity. Don’t leave those all important first impressions of your company to chance, let Under Pressure keep your building looking new, clean, and respectable.

FAQ – Residential Property Exterior Cleaning Services

We serve all types of residential properties including homes, town houses, apartments, condominiums and mobile home communities. To learn more about our residential exterior cleaning services and property types, visit our Residential Services Page.

Major vinyl siding manufacturers recommend a thorough and safe cleaning every 12 to 18 months. Removing buildups of dirt, debris, mold, algae and oxidation help prolong the longevity of your siding and make it look its best.

Not at all. However, if you won’t be home when we are servicing your property, We do require that you close all windows, clear your driveway or deck of all items such as furniture, grills, planters, etc., and remove any fragile decorations on your home or deck.

FAQ Residential Property Exterior Cleaning Services St. Louis Pressure Wash
FAQ Estimates Payments Guarantee Warranties St. Louis Pressure Wash

FAQ – Estimates   |   Payments   |   Guarantee   |   Warranties

St. Louis Pressure Wash, LLC carries a 2 million dollar insurance policy. We can provide this upon request.
Many contractors state they have insurance, but few actually have more than an automobile policy. If damage occurred to your home by a contractor, or an injury on your property you could easily be held responsible. Always ask for proof of insurance. That little question cold save you thousands of dollars.
We are very competitive with our pricing. Unfortunately for the consumer, our industry is plagued with fly-by-night little companies offering extremely low prices. They do this by not using professional equipment, cold water, inferior and often harmful chemicals, not carrying proper insurance, and by doing a low quality work that often results in damage to your property. According to the Better Business Bureau, low priced offers are most often associated with the most frequent consumer complaints and unresolved problems being reported. What we guarantee is a very fair and affordable price for the absolute highest quality exterior cleaning services you will ever find.
Yes, many of our regular customers are on our reminder list. We recommend keeping your property and deck clean and up to date.

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“I recommend them to friends and family.”

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Andy P.

“Justin and team spent considerable time explaining everything before we hired them. They worked hard against a tight deadline and bad weather. The work quality was excellent. I'd recommend them to friends or family.”

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“A quality and trustworthy company.”

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Shawn & Carol S.

“Justin and team did exactly what they said as promised and expected. We've used his company in the past and will always recommend St. Louis Pressure Wash to anyone looking for a quality and trustworthy company.”

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“Excellent, dependable contractor.”

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Ray W.

“Justin and his crew at St. Louis Pressure Wash are mature and professional. We've used them repeatedly for our commercial property as well as at our home. I've found this company to be an excellent, dependable contractor.”

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“Every year . . . always reliable and responsible.”

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Linda H.

“I've used Justin and St. Louis Pressure Wash for the past several years. They're always reliable and responsible. I love that Justin comes in person each year to ask if we want the service. They're quick, thorough and efficient.”

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“I definitely recommend this company!”

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Jayne M.

“Justin and his team pressure washed my house and cleaned my gutters. My house is SO clean! They took their time and did a thorough job. Their work was first rate and I'll use them again. I definitely recommend this company!”

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“It really helped our house sell.”

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Alisha D.

“We were getting ready to put our house up for sale and the work Justin and St. Louis Pressure Wash did really helped our house look great, sell faster, and for the price we wanted. A great investment for us in every way.”

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Residential Properties

We started our business nearly a decade ago helping St. Louis residents improve and protect their homes. And we can do the same for yours.

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Commercial Properties

We are proud to service some of St. Louis’s most important buildings. See how we can beautify and protect your commercial property.

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St. Louis Pressure Wash is Environmentally Friendly


We use hot water to clean the surfaces, as well as eco-friendly products that are guaranteed not to kill your vegetation. Exterior building surfaces are cleaned using high volume and low pressure, also known as soft washing.

We Clean All Surfaces

Every surface is different, and we know how to clean them all so they look great and are treated with the proper care. Flat surfaces required high pressure and hot water for best results.

Soft Washing Deck St. Louis Pressure Wash
St. Louis Pressure Wash is Environmentally Friendly


We use hot water to clean the surfaces, as well as eco-friendly products that are guaranteed not to kill your vegetation. Exterior building surfaces are cleaned using high volume and low pressure, also known as soft washing.

Soft Washing Deck St. Louis Pressure Wash

We Clean All Surfaces

Every surface is different, and we know how to clean them all so they look great and are treated with the proper care. Flat surfaces required high pressure and hot water for best results.

Our Guarantee

We Stand Behind Our Work

The founders of St. Louis Pressure Wash are born and raised in St. Louis. Our family and friends live here. We go to church here. Our kids probably play little league with yours. We have nothing without our reputation, so quality and your satisfaction are our only priority.

We stand behind our work 100%. Our job is not finished until you are totally satisfied. Our business does well year after year only by making each client so satisfied that they would hire us again, and recommend us to their family, friends and neighbors. We only accomplish this by completing your project perfectly to your satisfaction.

We are proud members with an excellent rating with the Better Business Bureau, and are happy to supply references at your request.

Level of Reliability

Quality of Work

Value Provided

Client Satisfaction

Call us today for a Free Estimate

(314) 962-4220

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You Can Find Us In St. Louis

Call Us

(314) 962-4220

Email Us

Find Us

P.O. Box 29421
St. Louis, Missouri   63126

You Can Find Us In
St. Louis, Missouri

Call Us

(314) 962-4220

Email Us

Find Us

P.O. Box 29421
St. Louis, Missouri   63126