Is anyone else having a problem with TruVue Conservation Clear glass? When I clean the coated side which faces the art, my cloth is turning yellow. i clean it several times, and the cloth keeps turning yellow. i called the company and they said its rare, but the curing process may have been off. i got a new box of the same kind of glass and I'm having the same problem! What's up??? I've never had this problem before in 17 years. I'm using the same glass cleaner and wipes as always.