Wet & Forget and Spray & Forget
Both of these products work the same. In fact, they were in court a few years ago. One was suing the other over patent issues.
We had almost a carpet of moss on our garage roof. Sprayed it last fall. The moss was killed but not all of it fell off during the winter & spring. We just used a hose and sprayed off the remaining clumps this past summer.
You do have to be careful to protect shrubs around your house foundation. Just follow the directions and wet the shrubs before and after applying to the roof.
You can get it (Wet & Forget) at Costco in the spring as it is considered a 'seasonal' item. True Value, Ace, & Do it Best also carries one or the other product. It's a lot easier to find these days.
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