1. Line the bottom of the pan with aluminum foil.
2. Set the silver object on top of the aluminum foil. Make sure the silver touches the aluminum.
3. Heat the water to boiling.
4. Remove it from the heat and place it in a sink.
5. Add one cup of baking powder to each gallon of water. If you need to, change the proportions. The mixture will froth a bit and may spill over; this is why you put it in the sink.
6. Pour the hot baking powder and water mixture into the pan, and completely cover the silver.
Almost immediately, the silver sulfide, or tarnish, starts to disappear. Within a few minutes, there is a noticeable difference in the silver's condition.
Silver Cleaning Chemical Reaction Video