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Silver rarely needs washing when it's attached to turquoise and, as cleaners can harm turquoise, it's generally best to stick to a light polishing. Use a commercial polish designed specifically for silver. You can find a silver polish online or at some department stores. Read your polish's instructions for precise directions. Usually, you use a cloth or rag to gently buff the polish onto the silver. Keep buffing until the silver shines and any tarnish, dirt, or debris are removed. Work extremely slowly when cleaning silver jewelry. Silver polish, even in small amounts, can harm turquoise. Take extreme care not to get any polish on the turquoise. In the event that trace amounts of polish end up on your turquoise, remove them right away. You can dab them out with a paper towel or rag.

Summary:
Use a commercial silver polish. Rub down the silver with the polish. Keep silver polish away from the turquoise portion of the jewelry.