What is soft washing?


Direct from Wikipedia, 
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.[1] 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.[2]
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),[3] or using a tank, gun, hose, and a 12-volt, air diaphragm, or gas-engine style pump.[4]

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