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Bought a small lake house in the Catskills, 3 tab roof has some moss. Brushed and hosed most off last year and had trees cut back. Still has some new growth this year. Any sources for zinc strips and/or cleaner ?
The improbable takes time, the impossible takes a little longer.
My local ABC Supply branch has "Shingle Shield" cleaner on their shelves. If your local branch doesn't have it in stock, they can order it and the zinc strips from their catalog and have it delivered to the local store with no shipping charges. Page 151 of their Spring 2012 catalog.