Cleaning Silver with Redox reactions

Tarnish is silver sulfide.  Place a tarnished piece of silver in a pyrex dish lined with aluminum foil.  Sprinkle baking soda on it and then add boiling water
No polish needed!  The sulfur is now bonded to the aluminum.  We also smelled some sulfur too.  The silver is clean!  Aluminum lost electrons, and was oxidized. Silver gained electrons so it was reduced.