This is a great way to clean jewelry at home. It works great on silver.
Lay a piece of Aluminum Foil in a bowl. Add a teaspoon of salt, sprinkle in some baking soda and add a squirt of Dawn dish soap. Heat water to hot but not boiling. Pour into bowl and stir.
Take your jewelry and lay it in the bowl.
Let it soak for 10 minutes.
Use a small brush, a toothbrush works great, to lightly brush jewelry. Remove and pat dry.