Roof washing is a safe, low-pressure cleaning method that removes algae, moss, lichen, and organic stains from shingles and other roofing materials without risking damage; technicians apply specially formulated detergents that break down growths at the root, allow grime to be rinsed away gently, and help restore the roof’s appearance and extend its service life, improving curb appeal and preventing premature deterioration caused by trapped moisture and biological growth.