Recently had a customer bring in a frame with museum acrylic, not optium, that she wanted us to re-use the acrylic. It was covered with fingerprints, first I used our 210 plastic cleaner and polish, that left horrible streaks. Then I used UnDo, which is great for fingerprints but that streaked too. I tried two different kinds of glass cleaner and both left bad streaks. The piece it was going over was very dark so the streaks really showed. Luckily it was a small piece so I ended up just replacing with a scrap of optium we had. What do you guys use to clean museum acrylic? As a rule, I don't clean it when I use a new piece.