What is the right way to remove moss on composition roofing?

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Dana

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I haven't tested it, but I've read that a strip of copper or zinc flashing peeking out from an upper course of shingles has sufficient toxicity to kill & prevent moss from growing down-slope of the exposed copper.

I'm sure it would take some time if the moss was well-established. You can kill the moss by spraying concentrated bleach on it, then hose it off weeks later when it's dried up & crumbling.
 
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