Unknown for coins, great for jewelry
Bought this to clean up collector coins I was getting ready to sell.  Good thing I read up in current collector blogs and articles before I did!  Unlike in the past, it now NOT recommended to clean your coins prior to swap or sale as it takes off the "patina" now desired.  Who knew?  I have, however, used it to clean some jewelry and silver, as well as copper items with great success.  Don't know if I would use it on silver plate, but it seems to work well on the solid silver, copper, and brass metals.
Rating: 3 stars