How to Clean Roof Shingles
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Spray the cleaner on a section of roof and let it sit for about 15 minutes.
Use the sprayer to saturate a strip 3 feet high x 10 feet wide.
Warning: Cleaning roofs is slippery work. Start at the lower portion of the roof, moving up as you clean each lower section. That way, you always stand on dry surface and reduce the chance of slipping.