You can try whatever you want to...that ain't ever going to come out. Anything short of plain ol' water, ski rope, or skin will leave a nice stain. Even life jackets manage to burn cleanly off. But beer, oil, grease, Pepsi, Gatorade will all leave tell tale stains. People are going to tell you to use Blue away and all other things, including alot of elbow grease, it have yet to see any of it work.