Try some automotive brake fluid, DOT3 or 4. Put a little on a small test area and wait for the paint to wrinkle a bit then immediatly wipe it off and use some cleaner (409, Simple Green, Orange Cleaner, Dishsoap, etc.)to remove any fluid residue. A good quality original finish will stand up much longer to the brake fluid than most rattle can paint so most likely the original paint will not be harmed.