I have found that alot of the black frames from Roma and other companies have a dull finish on them. When I putty the frames the putty leaves a grease spot on the frame after I wipe it away. I have tired cleaning it with so many products but the grease stays there and the finish seems to get smudgy. Anyone have trouble with this? What are you cleaning the frame with? It's making me crazy trying to figure out a way to keep the finish clean looking. Help!