Line the inside of the pot with aluminum foil so that the shiny side of the foil is facing up. Use a pot that is big enough for the silver plate to sit in.
Place the silver object into the pot along with ¼ cup washing soda.
Add 1 gallon boiling water to the pot and let it sit for 15 minutes. The washing soda will create a chemical reaction that will pull the tarnish spots from the silver.
Remove the silver from the water solution with a pair of tongs. Rinse it with clear water and dry it completely with a clean cloth.
Add just enough water to ½ cup baking soda to make a thick paste. The paste should be the same consistency as toothpaste.
Rub the paste into the green spots on the silver with a clean cloth. Rub until the tarnish is completely gone.
Rinse the silver with clear water and dry it completely with a clean cloth.