I’ve been using acetone and/or lacquer thinner. Every once in awhile it will go all the way through but I think those were weak spots from a previous job.Noice! I've started doing the same thing on mine.
Quick question- how have you been able to take off the white without taking off the blue? The purple scotch Brite pad and paint thinner combo went pretty quickly through to the red primer and then the metal in one place I tried.