bob2 posted:But here's an interim thing to try: Barkeepers Friend, right next to the Bab-O on the grocery store shelf. Make a poultice of that and water. A toothbrush will help.
I use it on my scratchbuilds, and afterwards often paint. So far no problems. I do a very light bead blast when I can, but trying that on an import can be hazardous due to warping.
I've used Barkeepers Friend liquid spray version on items prior to painting, worked well.