hi re removing sign writing, been valeting 7 years, got 7 vans to decomision nxt week, hot air gun to loosen stickers, use a plastic scraper available from diy or paint shops, tar and glue remover halfords not to good, give me a call if you want some heavy duty stuff needfacemasks and good quality rubber gloves marigolds wont do. strip off stickers remove residue glue, wash and leather vehicle if paintwork doesnt seem to match up !! might need some compound applied by buffer, dont use old fashioned t-cut its not good, need self lubricating compound easy to use trust me will leave my phone no 07815 305697