T-Cut do a very fine product that's almost like toothpaste. Much less abrasive than t-cut, slightly more so than a polish. I had to use it to get petrol stains off the side of the wife's car after she spilled all under the petrol cap, and didn't bother to mop it up or mention it to me for a week.

If it's just paint transfer that is sitting on top, that sort of thing will take it off without damaging the paint underneath.