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It is not good to leave any chemical on a surface especially one that turns into a salt . So I rinse and promote rinsing now ! it's my leg up on non rinsing crowds. Just got two more because I rinse and don't cause shingle shedding !
Ha ha ha..lol
You should never wash a roof. Pressure will damage it, but bleach is even worse. The best way to get rid of black streaks is to let the mold grow until the roof is a uniform black color.
Common sence chemical rinsing is working Beautifully . Don't give your asphalt shingles hypertension Rinse the salt!