i've used Spray and Forget(bought concentrate at Ace Hardware) on roof algae up north and also on algae here. Works great. I lightly scrubbed my roof up north and it looks like new! Kind of unbelievable. The good part is the residual on the roof keeps working and I just spray it every other year to keep algae growth in check and I don't have to scrub it again. I'm sure it extended the roofs life by years.
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"I am a great believer in luck, and I find that the harder I work, the more I have of it." -Thomas Jefferson
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