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Old 02-27-2020, 05:14 PM   #10
Notanlines
Senior Member
 
Join Date: Oct 2017
Location: Germantown, Tennessee
Posts: 716
I'm betting it is simply a little mildew growing on your roof. Try the above methods on a small section and see what you get, about a 10% solution with real bleach, not the cheap stuff.
Keep us informed please.
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