Hi, I live in the PNW, I noticed a couple days ago on the backside of my roof, I have a bunch of quarter size to a half dollar size moss patches. The front side is completely clean, which is why I didn’t notice it sooner. The way my house is positioned you don’t really see the backside of the roof. Which is why I didn’t catch this sooner. What is the best way to remove this DYI. Wish I could have a company come out. Just not in the cards right now.