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Brush off all loose debris and scrape off any large deposits of moss or algae. Apply the solution with a pump sprayer to cool shingles! If the shingles are in sunlight, the solution will evaporate before it can work. Keep the roof surface wet with the solution for at least 30 - 45 minutes. Scrub lightly with a broom or brush and rinse well with water. Try a test section first using just one quart of solution. If it is still stained, boost the concentration to 8 ounces per gallon of water. (BACK TO TOP) Removing Algae Stains from Roof Shingles.
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