I'm SLOWLY removing the residue from the playfield. I'm using shellite and some old rags. The good news is that under the contact and residue is a perfectly preserved playfield. The areas missing paint are not wear areas. They are not areas where contact removed paint, or high traffic has worn the playfield. There are two mysteries with this playfield. The paint "erosion" areas and the inserts which are popping out of the playfield. I have removed nearly all the inserts.