Soft washing is a cleaning method using low pressure and specialized solutions (typically bleach, water, and sometimes a surfactant) to safely remove mildew, bacteria, algae and other organic stains from roofs and other building exteriors. It is so named to differentiate the method from power washing. The Asphalt Roofing Manufacturers Association recommends low-pressure bleach or detergent assisted washing as the preferred method for cleaning asphalt roofs in order to prevent damage to the shingles.
Soft washing is a cleaning technique that can be achieved either by using a pressure washer with a special tip that will reduce the pressure rating down to around 500 psi (or less), or using a tank, gun, hose, and a 12-volt, air diaphragm, or gas-engine style pump.
Video Soft washing
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Source of article : Wikipedia
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