I have jewelry on consignment at several wineries, and it was recently time for me to rotate my inventory. When my pieces were returned, many were terribly tarnished, even the tiny spacers! They all look so awful. Is there something I can dip these pieces in without hurting the stones? Or will I have to take all the pieces apart and polish them by hand? My boss (we do research in wines and grapevines here at the University where I work) said the problem is the sulfur in the air at the wineries that's causing this.