For more frequently used items such as silverware, tarnish is easily prevented by constant use and washing with a mild dish soap.
"This kitchen version of electrostripping is safe and easy. It's especially useful for removing tarnish from flatware and holloware. In a pot lined with aluminum foil, mix a diluted solution of equal parts of baking soda salt, and liquid soap. A quarter cup of each to a gallon of water is a typical mixture. Set the sterling in the pot; bring the mix to a simmer and allow it to stand for 10-20 minutes as the oxides are transferred to the aluminum, which you'll see is darkened. Throw that away and wash the silver before using it".
Another way to treat tarnish is to put a drop of water and some fluoride toothpaste on a tissue and rub it on the affected metal. This method requires that the toothpaste contain SnF2 (stannous fluoride). However, it is currently (2008) much more usual to find fluoride toothpaste with NaF (sodium fluoride).
WIPO ASSIGNS PATENT TO SERENITY TECHNOLOGIES FOR "METHOD FOR IMPARTING TARNISH PROTECTION OR TARNISH PROTECTION WITH COLOR APPEARANCE TO SILVER, SILVER ALLOYS, SILVER FILMS, SILVER PRODUCTS AND OTHER NON-PRECIOUS METALS" (AMERICAN INVENTOR)
Sep 15, 2011; GENEVA, Sept. 15 -- Publication No. WO/2011/109807 was published on Sept. 09. Title of the invention: "METHOD FOR IMPARTING...