What I found works is Sticky Stuff Remover Gel, that i bought from Halfords, think it cost around a 4 or 5 quid, spray a little on a cotton bud, wipe it on, leave for a couple of minutes and then just wash it off
I found this works well on getting ink off VAM face's as well and doe's not tarnish or remove the original paint, as long as you don't leave it on too long and scrub all should be fine!