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May 10th, 08, 02:39 PM
You guys need to get on the roof forum here. It will provide alot of answers to your questions. 9% shouldn't be needed for roof cleaning. Do it under proper conditions and 4%-6% will work nicely.
Jeff
Jeff Wible
Raystown Pressure Washing
Hesston, Pa
Since 1996
(814)644-1396
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