Roof soft washing starts with a proper inspection to identify the roofing material — asphalt shingle, tile, or metal — since each requires a specific cleaning solution and application method to clean effectively without causing damage. The process uses a low-pressure application system to apply an algaecide/fungicide solution that breaks down organic growth at the root, followed by a controlled rinse at low pressure to clear away residue without forcing water under shingles or tiles. Surrounding landscaping, gutters, and drainage areas need to be protected or rinsed afterward, since roof cleaning solutions can affect plants if not properly managed. Because soft washing relies on the solution doing the work rather than pressure, allowing proper dwell time before rinsing is essential — rushing that step is the most common reason a roof cleaning job doesn't fully clear the staining.