heres some of my restoration's using the De-solv-it Graffiti Remover.They worked well on the older cars,only took half an hour to strip the renault 5 and golf and about the same for the countach,BUT be careful as i tried to use some on a body that was a few years old and made a right mess.i eventually cleared it off but cloudied the bodyshell,so resprayed and used as a basher.So try a small amount first and dont leave it to long.i did small amounts at a time.