This stuff is amazing: http://www.spraynine.com/
I have used it around my businesses (printing, restaurants), cars, and household. It is safe, non-corrosive & user-friendly; it takes anything off any surface with no mess, no fuss, no "after mess" or unpleasant odors. And, it is inexpensive!
Edit: I see you are from Hunt Valley. The guy who turned me on to this back in the 1980's is an old buddy who owned an auto-stereo/aftermarket/detailing business in Annapolis. He used it on everything, including car ashtrays that were coated with years of burned on tar. Amazing!
post edited by MetroplexJim - 2012/06/09 12:52:29