I met an old friend the other day who is now running a mobile car repair service (body). I mentioned that i was going to get hold of some clay to remove the tar spots from my car and then go about buffing the swirls out etc....he got some liquid stuff out of his van and rubbed my entire back bumper, removing every bit of tar within seconds.... leaving a haze to wipe off.... think this stuff was solvent based because it stank!! unsure as to whether this stuff is an industry secret or a cheapy ****** chemical that removes layers of laquer with it..anyone any ideas....