Soft washing is best for roof cleaning when organic growth, such as algae, moss, lichen, or mold, causes visible staining or buildup. It excels on sensitive roof types,s including asphalt shingles, concrete or clay tiles, and metal panels, where high-pressure methods can cause serious damage. This gentle approach applies low-pressure water (typically 150–300 PSI) combined with specialized cleaning solutions that kill growth at the root during dwell time,...