Not being a fan of walking around on a roof let alone a wet one, I tried doing this by moving a tall ladder around and scraping with a long-handle brush. The ladder worked but the brush didn't. I finally took the brush off and just used the plastic piece on the end of the pole to gently loosen the moss and algae and the garden hose to wash the mess off. Success!
This is a short-term solution, though. According to the internet, I can get rid of the problem permanently by cutting down my neighbor's tree (no, he will not like that) or putting copper or zinc strips under the top rows of shingle. Oh, wait a minute! I could also spray Wet and Forget once a year. What? Yes, after all that work, I find rave reviews for this product on Amazon. I could have sprayed the roof with Wet and Forget and not only would the moss and algae have washed off by itself in the rain, BUT it would have prevented further buildup for a year. The Wet and Forget 10587 is a moss, mold, and mildew remover while Wet and Forget 800003 is for moss, mold, mildew, and algae.You should see the reviews for these products! I can't get it locally, but I have placed an order on Amazon. No more hours of scrapping for me.
As soon as it stops raining, I get to start painting this in a lovely shade of gray.
Just in case you're wondering what happened with my sewing room, it's almost finished! I'm waiting for a couple of things that are on order including some vinyl wall decals! I've never used them before. Can't wait to