As with all things - best to try on a small patch first (perhaps on the inside of the body) - i have used standard car polish and T cut to good effect before - use an ear bud to apply in small amounts and then polish off - just like a real car.
I steep the bodies in a lukewarm mix of washing up liquid & water.
If they need polishing I use Autoglym super resin polish.
Some 60s brands of slotcars had a metallic finish, don`t use TCut or other colour restorers on these car.
Some of the Scaley cars made of the soft plastic (eg Panther,Europa Vees) don`t polish up quite as well.
Some folk use floor polish (Johnsons Klear I think) on these to good effect. I never have.
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