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Removing Black Stains On Asphalt Shingles

Name: John Sak  City: Raleigh NC

Question: I did not have good roof ventalation and this caused several areas of black stains on some of my asphalt shingles because of too much heat on the roof. I have had good ventalation installed, but now I want to get rid of the black stains on the shingles without damanging the shingles. Any ideas? Thank You