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Beautiful Metal Roof Cleaning! You can use a water based tire dressing sold by the gallon all over the place online. We make it but don't sell it. Google shop the following search words: 5 gal water based tire dressing http://www.google.com/m/products?source=mog&hl=en&gl=us&client=safari&q=5%20gallon%20water%20based%20tire%20wax The above link is the result that I received. I was not trying to hijack your awesome roof cleaning, just trying to help and save you some bucks by thinking outside the box. When you stay away from industry specific chemicals sold by pressure washer companies, you will find that you keep more of that hard earned green paper in your picket and NOT OURS!!!

-- Edited by Pressure Washer Products on Sunday 29th of May 2011 04:22:10 PM