Soft washing is a cleaning method that uses low-pressure water combined with specialized chemical solutions (typically sodium hypochlorite, surfactant, and water) to remove algae, mold, mildew, and organic stains from exterior surfaces. Unlike high-pressure washing, soft washing relies on chemistry rather than force, making it safe for delicate surfaces like vinyl siding, roofs, stucco, and painted wood. The cleaning continues working for days after application.
A homeowner's north-facing vinyl siding has green algae streaks. The technician applies a soft wash solution at 60-80 PSI (compared to 2,000+ PSI for pressure washing), lets it dwell for 10 minutes, and rinses to reveal a clean surface without risk of damage.
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