Silver Soak your silver in a glass dish lined with aluminum foil filled with warm to hot water* and baking soda (4 to 5 tablespoons; I've also seen a similar method, but the item is tightly wrapped in the aluminum foil with slits cut into the foil to allow the water/baking soda solution to seep into the foil package.
Store your silver pieces with a bright copper penny, or those silica gel packs often found in packing material.
Make a paste of 3 parts baking soda to 1 part water. Using a soft cloth, rub the paste gently on the silver. Tarnish will disappear rapidly. After rinsing, buff the silver with a soft cloth.
Make a paste by mixing powdered white chalk with just enough ammonia to moisten. Rub the paste gently on the silver with a soft cloth. Rinse and buff to bring up the shine.
Copper Make a paste of 1 tablespoon salt, 1 tablespoon flour, and 1 tablespoon vinegar. Rub it over the copper surface, then wash the copper object in hot soapy water. Rinse and buff for a shiny finish. Also works for brass.
Mix 2 tablespoons vinegar and 1 tablespoon salt to make a copper cleaner. Wash, rinse, and dry the item after this treatment. A cut lemon or lime dipped in salt will also clean copper.
*if your pieces have lampworked or glass beads remember not to take from hot water and rinse in cold water - let the beads cool before rinsing.