Paint stripper containing MEK will do it, but I don't know if it is still made. A friend told me one of the strippers made with acetone would do it, but I haven't tried it. It is like asphalt, because that's about what it is. You can also use a propane or mapp torch and a scraper, but if you are trying to save paint, that isn't a good idea. And if you have any Bondo hiding under the paint, it will be gone with heat. A guy in high school used kerosene, but it sure isn't easy to find today and is very $$$. Diesel fuel might work. Finally a few years ago a fellow told me he bought some tar and bug remover in a spray can (think it was at Wal-Mart) and said that stuff would dissolve it, but it took time. Good luck.
