Trisodium phosphate (TSP) is a powerful cleaning agent specifically designed for moss removal. Handle with care, as it can cause irritation. Use a spray bottle to apply TSP solution, and brush or scrape away moss. Wear safety gear and ventilate the work area. TSP is effective on asphalt shingles and metal roofing, but requires gentle methods on tile roofing. Choose soft washing for metal roofs and avoid pressure washing on tile roofs. Consult roof maintenance companies or home improvement stores for additional information and recommendations.