Our cleaning process involves the no-pressure application of an industry-proven mix of detergents. No power washers are used in the process. The system we use is recommended by ARMA (Asphalt Roofing Manufacturers Association) and GAF (North Americau2019s largest shingle manufacturer), and is safe for your home, family, pets, and any adjacent landscaping. Most average residential roofs can be cleaned by our two-man team in four hours or less!