I use "409". It's a spray-on as it's sold, but I pour 4 or 5 bottles into a bucket, add just a little bit oif hot water, and use a medium bristle scrub brush on a broomstick to scrum. Rinse thoroughly, let dry, then use the spray-on roof protection, working that in with a softer bristle brush.
I use the same "409" treatment on my awning. Works great!
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Fire Instructor
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