Quote:
Originally Posted by 66joej
I have used Awesome Orange diluted with Dawn and water. Scrub, let sit then rinse with lots of water. Seems to work great on the old original Cougar roof. I do it in the spring and seems to stay clean all summer. YMMV
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Be very careful with citric acid based cleaners. They will soften TPO roofing membrane, so if you don't get it all rinsed off, look for "sticky roofing" after a couple of weeks..... BTDT.....