Ditto what Bigs said. WD-40 used without rubbing to hard and an immediate clean up is about as good as any "tar remover" you can buy. WD-40 also works as a great adhesive tape residue remover, in case anybody ever needs to get that junk off of anything. Apply enough to really wet it, let it soak in for a minute or two, then wipe carefully. pete the ex glass guy