I squirt the flat roof on the back of our terrace with path clear once a year, then pick the moss out of the stones.
Neighbours roof (on the other side of a 30cm wall divide is rotten, so much moss the birds sit on it picking out bugs or whatever is in the moss that they seem to like.
Has to be done as a spray, and if it rains anytime before the 1st 48 hours it's going to become diluted to the point where is won't do anything.
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