The above video details a method using baking soda. See one with salt below.
A lot of us eco-nuts have silver jewelry that needs to be cleaned occasionally, lest it leave black marks on our wrists, fingers, or ears. Problem is, most jewelry polish is toxic and shouldn’t be going on anything that we are wearing on our bodies. A safer and cheaper method can be found here – line a sink with aluminum foil, shiny side up. Load it up with all of your silver. Fill it with hot water. Then, add 2-3 tablespoons of salt per cup of water, or 1/2 to 3/4 of a 1 litre box for a regular kitchen sink. Let it sit for 15 minutes. Depending on the age of the varnish, it will lift right off with the ensuing chemical reaction between the salt and the foil.
For source material, check this page. Other natural silver polishes that you can find on the internet involve cream of tartar, lemon juice and hot water, or baking soda and hot water. Go a little farther with these suggested recipes on more stubborn pieces of silver.
For usual household use, you don’t need anything but lemon juice and baking soda to clean up your messes. Save money, the environment and your health by going with home remedies for spring cleaning!