For sterling silver, copper, brass, bronze or gold, swish your jewelry in Jewelry Cleaner, let it sit a bit, rinse with warm water, and dry with a soft cloth. For really tarnished pieces, wet the toothbrush, pick up a bit of Tarnish Remover, scrub gently, rinse with warm water, dry with a soft cloth, and your metals will gleam. I use Renaissance Wax on my metal jewelry. It provides a barrier between the metal and your skin as well as retarding oxidation (a.k.a. tarnish). Like any coating, it will eventually wear off. You can use paste wax to provide similar results each time you clean and polish your metal jewelry.
Finally, don't use toothpaste to clean your jewelry. It contains abrasives and may leave scratches.
May your jewelry always shine!
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Lynn's musings about all facets of jewelry.