When I touched up the bare areas on the seatstays caused by rubbing of a flat tire during a ~5 mile walk home a while ago, I used acrylic primer and paint because I had those at hand. Unfortunately, my masking was not as thorough as I had tried to make it (tip: use masking tape for masking, not electrician's tape) so that little tendrils of primer escaped and dried on the powerdercoat.
What is the best way to remove these without harming the powdercoat? They are not thick, but they resist mineral spirits and I've not tried any other solvent or mechanical method.