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and clean my roof while I'm at it.
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I assume you have composite shingles? [fiberglass shingles]
Be VERY carefull doing that. You can cause a lot of extra wear and tear on the roof.
A better methiod that I have used is to buy swimming pool Clorine [sp?]
Put it in a pump up sprayer and coat one half of your roof. Then just hose it off with the garden hose. Then do the other half the same way.
No scrubbing needed or wanted. No high preasure to screw thing up.