Caring for silver plated jewelry is similar to sterling silver jewelry. To remove tarnish from silver plated jewelry uses the same recommend cleaning techniques for cleaning sterling silver. The only major difference is reducing the amount of polish used as over exposure can inadvertently remove the silver plated.
Unlike sterling silver, silver plated jewelry will eventually wear in due time. Proper cleaning, maintenance, and storage are critical for extending its life usage. Some silver plated jewelry will last longer than others depending on the thickness of its layer.
Use polishing cloths. They are not abrasive and it will remove tarnish without a lot of effort. You can also try a tarnish removing paste found in jewelry stores, but be careful. Some products can be highly abrasive and would remove the plating after each polishing.