whats the best way to get rust marks from van paintwork? (paint is fine, its rust marks from a bit of rusty steel used to cover a lock hole thats gone onto the paint)
T-Cut and similar products have long since been reformulated for water based paints, but check the label anyway if your van has water based paint as you can still buy the original stuff.
The Autoglym is a superb product, but expensive if you're just looking to remove a few marks.
Also don't forget to reapply a polish layer after treatment with any 'paint restorer'.