At North West Fresh Roof, we use an eco-conscious soft washing approach to safely eliminate harmful roof organisms. This method relies on carefully measured biodegradable treatments to ensure complete eradication. Unlike pressure washing—which can harm roofing materials and potentially promote the return of algae and bacteria—soft washing is gentle yet effective. If left untreated, these infestations can shorten the lifespan of all types of roofing materials, including shingles, tile, slate, wood shake, membranes, and metal, by as much as half.