I've been cleaning up some smoke damaged razors. What seems to work best on the soot is a product called Simple Green. Problem is that it's rather expensive considering the volume of it that I'll be needing. The active ingredient appears to be polyethyleneglycol. I'm wondering just how similar that would be to antifreeze. I know that if you have a head gasket leak, and antifreeze gets into your cylinders, it breaks down the oil and leaves your cylinder walls nice clean and shiny (and almost totally lubrication-free). Does anybody know how this might react to nickel and gold plating?