I had made 4 dozen "angels" using Delica 11/0 seed beads and had them individually boxed with the prefilled boxes from you over the summer months. I was looking at them now and a lot of them are tarnished especially the gold and silver "wings" on the angels. My instructor had me coat the angels with nail polish to seal the ends of the threads and also to stiffen them ... is there something I can use to clean the tarnish and polish them again? And what should I be using to prevent tarnishing in the future? Thanks! The angels that I have worn all summer are not tarnished and they are out in the open! I am certainly puzzled!