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Removing stains from a powder coated steel surface

I own a pressure Washing Business and I have to remove dark Stains from a powder coated paint steel surface. I have NO idea if the dark stains are from oxidation or what? We could remove the dark stains with heavy scrubbing and a heavy degreaser. I guess I am wondering if there is something other I can spray on the surface and then go over it with a high pressure wash? Any suggestions?

Paul White
Pro Power Washing - West Bloomfield, MI, U.S.A.

This is a long shot! Have you tried methylated spirits? Or pure ethanol.

Paul Beel
- Durham, UK

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