Silver-plated cups are made of metal coated with a thin layer of real silver. These items require extra care while cleaning to prevent chipping the silver. Handle the cups gently and never use any harsh abrasives. Clean silver-plated items with a mild soap and remove tarnish with a baking soda solution.
Fill your sink with warm water and a little dish soap. Wash the cups with a sponge to remove any residue.
Rinse and dry the cups. Drain the sink of soapy water.
Cover the sink bottom with a sheet of aluminum foil. Refill with warm water and add 1/4 cup baking soda. Make enough solution to submerge the cups.
Submerge the silver plated cups under the water, making sure they touch the aluminum foil. The tarnish should disappear after a few seconds.
Rinse the cups again and dry thoroughly.