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Summary: Usually, the easiest way to get paint off of car windows is by using a simple razor blade. Find out how to wash a window, after using a razor to remove paint, with help from car restoration specialists in this free video on car maintenance.
"So, some kids came by on mischief night and got some paint on your window. Well, in this video, I'm going to show you how easy it is to get it off. Whenever you get something on a window, most of the time, the easiest way to get it off, is with nothing other than a plain old razor blade. You take the razor blade, and you just go nice and easy over the paint, or gum or goo, or residue, or whatever it may be, that you have on your window. It takes it right off, it's painless, completely painless, nice strokes through. Once you get it off, to get every last little bit, and then if you want, wash the window with some Windex, or some other sort of cleaner, and there you go."
eHow Article: How to Get Car Paint Off of Windows