I found that a good steam clean first to get the worst off and stickers if tatty, then a pan scrubber with Jif (sorry I mean Cif) cream cleaner with hot water and I used wire wool in some areas to hide the scratches (it works, but don't go mad)
As some of you know I keep a bottle of spray flash and a cleaning cloth in the boot as this will quickly clean Charlie up if wanting too
Retro Andy.