We recommend different from regular cleaners like Dawn our Roof Protect, an eco-friendly, biodegradable cleaner designed to complement our Liquid Butyl Rubber products and give you the best results from your roof coating application. Apply prior to power washing. Our Roof Protect emulsifies contaminants and provides improved surface preparation and adhesion by effectively removing oil, grease, mildew, dirt, and other soils from your roofing membrane. You can also use Roof Protect annually to further protect your roof allowing, dirt, grease, etc. to be removed, further extending your roof's service life. It also contains a mildewcide to kill any mold spores on your roof prior to application.