I really wasn't expecting much from this product, but WOW. It really took the tarnish off my costume and silver plated jewelry that I was seriously considering throwing away. I had already tried blitz liquid cleaner in my sonic cleaner without much luck, and even tried rubbing Blitz directly on the jewelry itself (not supposed to be used undiluted), and barely made a dent. This took off ALL tarnish with just a few rubs and little effort. I really am amazed. Definitely one of the most satisfying purchases I've made.