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Roof Wash our -safe roof cleaner will remove stains on your roof from molds or fungus. It will not damage your home or the landscaping and will not put your children or pets at risk. Use Roof Wash to remove stains caused by moss black algae mold lichen or any fungus that may grow on roofs. It’s highly effective on all types of roofing material: asphalt metal tile wood shake rubber and new composite materials. Directions: Add 3/4 cup per gallon of water mix well stirring frequently allow solution to fully activate for 15 minutes prior to use. To clean stains caused by moss without rinsing just apply and leave the rain will do the rinsing. Allow 60 days to pass before reapplying if needed. For instant results removing stains caused by moss mold or black algae apply to roof with a pump sprayer or other spraying methods and use a pressure washer at low speed to rinse the roof this is the optimal means of cleaning a roof a scrub brush and hose may be substituted.