Low-pressure chemical treatment that kills biological growth at the root — the correct method for roofs, stucco, and all surfaces that cannot withstand high-pressure water impact.
Soft washing is the professional cleaning standard for any exterior surface that would be damaged by high-pressure water — and in Southwest Florida, that category includes most of the significant exterior surfaces on a home. Roofs, stucco walls, painted block, vinyl siding, soffits, fascia, and screen enclosure frames all require soft washing rather than pressure washing. The reason is simple: soft washing uses chemistry to kill biological growth while using water only for delivery and rinsing, never as the primary cleaning mechanism.
The practical difference matters enormously. A pressure washer at 2,500 PSI applied to asphalt shingles strips the protective granules that extend shingle life. Applied to stucco, it causes surface pitting and hairline cracking. Applied to painted surfaces, it peels paint. In every case, the surface is damaged by the cleaning process itself — requiring expensive repairs that could have been avoided entirely. Soft washing achieves a better, longer-lasting clean without any of this risk.
Rain Exterior Home Service uses soft washing as the standard approach for roof and exterior wall cleaning throughout Fort Myers, Cape Coral, Naples, Bonita Springs, Estero, and surrounding communities. Our cleaning solutions are professional-grade, biodegradable formulations that kill algae, cyanobacteria, mold, mildew, lichen, and moss at the cellular level. The result is a clean that lasts significantly longer than pressure washing alone because the organism — not just its visible surface layer — has been eliminated.
For homeowners who have been quoted pressure washing for their roof or stucco walls, we encourage you to ask about the method being proposed and the PSI being used. If the answer is a high-pressure wand, the wrong tool is being used — and the short-term cost savings will come at a longer-term cost in surface damage. Soft washing is not a premium upgrade — it is the correct method for the surfaces involved.
Results
How It Works
We identify whether the surface has algae, mold, mildew, lichen, moss, or cyanobacteria — each responds differently to cleaning solutions, and the correct formula is selected for your specific situation.
Plants and landscaping are thoroughly wetted. Windows are closed. Gutters and downspouts are checked so rinse water exits properly. Any fragile surfaces nearby are protected.
A professional-grade biodegradable soft wash solution is applied at low pressure — typically under 500 PSI for roofs and stucco. The solution penetrates and kills biological growth at the root level.
After a 15 to 30 minute dwell period, the surface is rinsed gently from top to bottom. Plants receive a final rinse. Every surface section is inspected for complete coverage before the job is finished.
Common Questions
Pressure washing relies on high water pressure — 2,000 to 4,000 PSI — to physically blast contaminants off surfaces. It is effective for hard surfaces like dense concrete that can withstand impact. Soft washing uses low pressure — typically under 500 PSI — combined with a professional cleaning solution that kills biological growth chemically. The solution does the cleaning work; water just delivers it and rinses. Soft washing is the correct method for roofs, stucco, painted surfaces, and any material that cannot withstand high-pressure water impact.
Roofing materials (tile, shingle, metal), stucco, painted block, painted wood, vinyl siding, soffits, fascia, and screen enclosure frames should all be cleaned using soft washing rather than high-pressure washing. Using pressure washing on these surfaces causes cracking, pitting, stripped granules from shingles, and paint peeling — damage that is expensive to repair. Concrete driveways, pavers, and pool decks can generally tolerate moderate pressure washing, but even these benefit from a pre-treatment step.
Soft washing kills biological growth at the cellular level. Pressure washing physically removes the visible portion of the growth from the surface but leaves the root structure and spores behind — growth returns much faster after pressure washing alone. Soft wash solutions typically contain sodium hypochlorite as the active biocide, which kills algae, mold, and cyanobacteria on contact. After a proper soft wash treatment, surfaces stay clean significantly longer than after pressure washing only.
We use professional-grade biodegradable formulations that break down rapidly in the environment. The active biocide in most soft wash solutions — sodium hypochlorite — is the same compound found in pool shock treatments and is used in municipal water treatment. When diluted and applied correctly, and rinsed properly after dwell time, the environmental impact is minimal. We always pre-wet plants and post-rinse landscaping to further reduce any contact with cleaning solution.
Soft washing is primarily effective against biological growth — algae, mold, mildew, and cyanobacteria. Hard water stains (calcium carbonate deposits from irrigation systems or hard tap water) are mineral deposits and require a different chemistry — typically an acidic cleaner or descaler rather than a biocidal soft wash solution. We often combine treatments: soft wash for biological growth and a separate descaling agent for mineral deposits on glass, tiles, and concrete surfaces.
What Homeowners Say
"I did not understand the difference between soft washing and pressure washing until Rain Exterior Home Service explained it. They soft washed the roof and house in one visit. The roof in particular is completely black-streak-free — looks brand new."
"Very thorough and professional. They explained why pressure washing would damage my stucco and used the correct method. The result speaks for itself — the entire exterior looks clean and the plants were completely unaffected."
Serving Fort Myers, Cape Coral, Naples, Bonita Springs, and all of Southwest Florida. Most jobs quoted within 24 hours.
Rain Exterior Home Service
We Regularly Serve Homeowners in Southwest Florida: