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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Jim and DW 50 years Brenda
2018 40rssa and 2021 Jayco Eagle 40'
2019 F450, ruby red
Harley Road King & sidecar
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