Hence my original question.
I used to use a very good chemical cleaner called PrepSol, it's mainly used as a marine craft cleaning product. We used to use it for preparing cars. It was strong enough to cut through road film, wax etc, but didn't penetrate paint. Stronger than meths, white spirit, petrol, but not as fierce as thinners or acetone.
So, acetone is good and I would use it more, but I would prefer to dilute it so I can work with it a bit more comfortably as you have to move to fast using it neat.