I'm doing my first playfied resto (minor touchup, mostly). Following the process on pinrepair.com, I used Magic Eraser and some isopropyl alcohol to get rid of surface dirt, swirl marks, etc. (and it did a treat job). Since this was my first go-round, I took it real easy to make sure I wasn't removing paint, hitting primer, etc. Next, I used some Naptha to remove the residue. But as soon as the Naptha dried (almost instantaneously), white streaks and spots appeared across the playfield (see photos, left is 'before,' right is 'after'). These marks were not there (or apparent to the naked eye) before the Naptha. Also, if I hit the streaks with more Naptha they disappear, but then reappear. Did I do something wrong? Any way to permanently get rid of the streaks?

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