We've had great results with a product called Wet and Forget to get moss off our northern exposure roof. After spraying, the moss disappears over time so the Forget part of the name is very important. We had a 17-year-old, terribly mossy roof and the treatment cleared it up completely in about 9 months or so (we forgot to look). After several years, it is beginning to return so we'll just treat it again. Wet and Forget is even available at Lowe's now. We're equally pleased with another product of theirs--their weekly shower spray--it's the only cleaner our steam shower gets!
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