What Goes Into a Professional Pressure Washing Service | Simple Clean LLC
- Owner-Operator of Simple Clean LLC Power Washing Services
- Power Washers of North America Board of Directors
- PWNA-Certified House Wash Specialist
Inside a Professional Pressure Washing Service: Methods, Chemistry, and Property Protection
Most homeowners only see the result of a pressure washing service: brighter siding, clean concrete, a roof without black streaks. The work that produces that result is far more involved than pointing a wand at a wall. A professional service follows a defined process that balances cleaning power against surface safety, chemistry, and protection of the property around it.

At Simple Clean LLC, we’re a PWNA-certified, owner-operated company serving Media, PA and the surrounding communities. Here’s what a professional exterior cleaning actually includes, step by step, so you know what to expect and what to look for in any contractor you hire.
Why “Pressure Washing” Is More Than Pressure
The phrase “pressure washing” suggests that high pressure does the cleaning. On most residential surfaces, it shouldn’t. Mold, mildew, and algae are living organisms, and blasting them only removes what’s visible on the surface. The growth comes back quickly, and the pressure can damage siding, strip paint, etch wood, and force water behind exterior cladding.
A professional service uses the right tool for each surface:
- Higher pressure for hard, durable surfaces like concrete driveways, patios, and walkways
- Low-pressure soft washing for siding, soffits, gutters, and roofs, where cleaning solutions do the work instead of force
Understanding that difference is the foundation of everything else in the process. Our guide to pressure washing vs. soft washing breaks it down in more detail.
Step 1: The Property Assessment
Every quality job starts with a careful look at the property before any equipment is set up. A trained technician evaluates:
Surface Materials
Vinyl, aluminum, painted wood, Hardie board, fiber cement, brick, stone, and composite decking all respond differently to water and cleaning solutions. Each one has its own vulnerabilities.
Type and Severity of Staining
Light green algae, heavy black mildew, and roof streaking (often caused by Gloeocapsa magma) each call for different solution strengths and dwell times.
Pre-Existing Conditions
Loose siding, failing caulk, rotted wood, loose shingles and flashing, oxidized surfaces, and exposed wiring all affect how a surface can be cleaned safely. A professional identifies these before work begins and discusses any concerns with you.
Landscaping and Surroundings
Plants, shrubs, lawns, outdoor electrical components, and drainage paths all need protection during the job.
Step 2: Protecting the Property
Before any cleaning solution touches your home, the property is prepared.
Covering Electrical Components
Worn or exposed outlets, fixtures, and electrical components are covered and taped to keep water out and prevent hazards.
Pre-Rinsing Plants and Landscaping
Plants and surrounding surfaces are thoroughly wetted before application. Saturated foliage absorbs far less cleaning solution, which is one of the simplest and most important protective steps in the process.
Confirming the Home Is Sealed
Windows and doors must be closed and latched. High volumes of water are used throughout the job, and any opening can let water inside. Homeowners can review our full service preparation checklist before their appointment.
Step 3: Applying the Cleaning Solution
This is where professional soft washing separates itself from basic pressure washing.
The Right Chemistry
We apply a sodium hypochlorite solution, typically mixed between 1.5% and 2.5% depending on the surface and the severity of the growth. Sodium hypochlorite kills mold, mildew, and algae at the root instead of just removing what’s visible.
Dwell Time
The solution needs time to work. Depending on how heavy the organic staining is, we allow a dwell time of roughly 5, 10, or 15 minutes. Rushing this step leaves growth behind; leaving it too long without management risks streaking or stress on nearby plants. Getting dwell time right comes from training and experience.
Low-Pressure Application
On siding, soffits, and gutters, the solution is applied at low pressure, gently enough that it cleans without damaging the surface or forcing water behind it. Learn more about what soft washing is and why it’s the industry standard for home exteriors.
Step 4: Rinsing and Neutralizing
Rinsing removes the loosened growth and residue from the surface. A professional service doesn’t stop there.
The Neutralizing Rinse
After the cleaning solution has done its job, we post-rinse with a neutralizing solution made with sodium thiosulfate. This neutralizes any remaining hypochlorite on the surface and in the surrounding landscaping, which protects plants, lawns, and finishes after we leave.
Post-Rinsing Every Surface
Every job includes both a pre-rinse and a post-rinse. Plants, walkways, windows, and adjacent surfaces are rinsed down again so nothing is left behind.
Step 5: Surface-Specific Techniques
Each part of a home needs its own approach. Here’s how the process changes from surface to surface.
House Siding
Siding is soft washed, not blasted. Low pressure and the right solution remove algae, mold, and dirt without cracking vinyl, stripping paint, or pushing water behind the panels. See our house washing and vinyl siding cleaning services.
Roofs
Roof cleaning should always follow the guidelines of the Asphalt Roofing Manufacturers Association (ARMA), which recommends against pressure washing shingles. We apply the solution from the gutter line and rinse it off without ever walking on the roof deck. A house wash is always performed with a roof wash, since runoff carries onto the exterior below. Heavy staining can take a few months of rain to fully clear after treatment. Learn more about our soft wash roof cleaning.
Concrete, Patios, and Walkways
Hard surfaces can handle higher pressure, often with surface cleaners that produce an even, streak-free finish. See our patio and walkway cleaning and flatwork cleaning services.
Decks
Wood and composite decks need careful handling. Newer capped composite decking usually cleans up with water and pressure under 1,500 PSI, without soft wash chemicals. Older, uncapped composite boards are porous, hold moisture, and are more prone to organic growth, so they call for a different approach. Explore our deck cleaning service.
What a Pressure Washing Service Does Not Include
A professional will be upfront about the limits of the service. A standard wash targets organic growth and dirt. It does not remove:
- Rust
- Oil and grease
- Glue, paint, and caulk
- Concrete residue or other non-organic materials
It’s also important to know that no product on the market prevents mold, mildew, or algae from eventually returning to siding. Any contractor promising permanent protection is overselling. Routine cleaning is what keeps a home looking its best. If you’re not sure when your home is due, here are the signs it’s time to clean your siding.
How to Choose a Qualified Pressure Washing Company
Anyone can rent a pressure washer. Very few operators understand the chemistry, surfaces, and safety practices covered above. When comparing companies, look for:
Industry Certification
PWNA certification shows a contractor has been trained in safe cleaning practices, proper chemical use, and surface protection. Read what PWNA certification means for homeowners.
Proper Insurance
A fully insured contractor protects you if something goes wrong on your property.
Direct, Owner-Operated Service
Lead resellers and middlemen mark up the price and subcontract the work. Booking directly with the company doing the job gets you better value and clear accountability.
Clear Communication About Limitations
A trustworthy company explains what the service will and won’t accomplish before the work starts.
Frequently Asked Questions
Is pressure washing safe for my house?
Yes, when the right method is used. Siding, roofs, and other delicate surfaces should be soft washed at low pressure. High pressure is reserved for hard surfaces like concrete.
Will the cleaning solution hurt my plants?
Not when the job is done properly. Pre-rinsing plants, using controlled solution strengths, and finishing with a neutralizing rinse protects your landscaping.
Do I need to be home during the service?
No. As long as we have access to every area on the work order and the windows and doors are closed, the job can be completed while you’re away.
How long does a professional pressure washing service take?
It depends on the size of the property, the surfaces being cleaned, and the severity of the staining. Your quote will include an estimate.
For more answers, visit our frequently asked questions page or review our pricing guide.
Schedule Your Professional Exterior Cleaning
The difference between a quick rinse and a professional exterior cleaning is the process behind it. Simple Clean LLC brings PWNA-certified training, the right chemistry, and careful property protection to every job across Media, PA and the surrounding service areas.
Call or text 267-549-8538 or request your free quote today.
About the Author - Ryan McGowan
Ryan McGowan is the owner-operator of Simple Clean LLC Power Washing Services, based in Media, PA, and serving Delaware County, Chester County, and the surrounding Southeastern PA area since 2017. With 20+ years of hands-on experience in exterior cleaning, Ryan personally leads every job — no subcontractors, no rotating crews, just the same trained professional from the first estimate to the final rinse.
Ryan is a PWNA-Certified House Wash Specialist, holding credentials in House Washing, Roof Cleaning, and the Fundamentals of Power Washing through the Power Washers of North America. He also sits on the PWNA Board of Directors and contributes to its Marketing Committee, helping shape higher standards across the exterior cleaning industry — not just following best practices, but helping write them.
Beyond the certifications, Ryan's training includes OSHA 1910, DOT, EPA environmental compliance, GHS/HazCom, ladder safety, chemical safety, and first aid — the kind of behind-the-scenes preparation that homeowners rarely see but always benefit from. Simple Clean LLC is also AskTheSeal accredited, giving clients verified confidence in exactly who's showing up to their property.
When Ryan writes about power washing, soft washing, or house washing here on the blog, it comes from two decades of actually doing the work — not just marketing it.
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The owner is on every job — not managing from an office while a subcontractor shows up. With 20+ years of hands-on experience and 222+ five-star reviews across four counties, you know exactly what you're getting before we ever pull up to your property.
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Simple Clean LLC holds active PWNA certification with specific credentials in house washing and roof cleaning. That means trained, tested, and accountable — not just a pressure washer and a pickup truck.
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Same owner-operated team you trust for exterior cleaning, now painting interiors — careful prep, two-coat finishes, and a standard that holds up long after the last coat dries.
Every winter, while our exterior schedule slows down, Simple Clean LLC turns its full attention indoors — bringing that same detail-first approach to homes and businesses throughout Media, PA. One owner, one standard, no rotating crews: the person who quotes your project is the same one prepping it, painting it, and walking it with you at the end. From a single room refresh to a full interior repaint, we only take a limited number of projects each season — so early booking matters.
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