I just wanted to thank the person who suggested Simple Green as a
cleaning solution. I got back some jewelry that had been worn by the
salespeople in the store on a regular basis. The pieces, which were
silver with stones, looked pretty bad, tarnished and smelling
strongly of the perfumes and oils used by the wearer. Soaking them in
a roughly 50/50 Simple Green/water warm solution did the trick. What
I thought was tarnish turned out to be dirt and the work came out
impressively clean. Not something I would have thought to use myself.
Thank-you for a very good suggestion.