Pressure Washing can actually damage a roof. Some pressure washers can go up to 4,000 psi which is way to much for a roof. Plus pressure washing can not use a high enough ratio of cleaner to water to kill the infected areas. SoftWashing only goes up to 100 psi and can utilize the right ratios to kill the infected areas. With only pressure washing results might last but 1 year at best but SoftWashing the results can last for several years. https://www.xcellentxteriors.com
