Avoid alcohols and acids like ammonia and vinegar. Read the label of the solution to make sure it can be used with the metal being cleaned.
Avoid using soap and water when cleaning costume jewelery. Soaps tend to leave a mark on the surfaces of metal or cause the stones to look dull.
While vinegar is lethal to precious gemstones, Windex is also detrimental to delicate finishes of jewelry. Recommended cleaners you can use are chemical, toothpaste, natural, and cloth. Of these toothpaste has been famed to be the low-priced yet effective solution.
Use the solution to clean smudges from gemstones and glass. Dab a small amount onto a cotton swab, and gently buff the dirty spot. Never soak jewelry in the solution, because moisture breaks down glue, welding and other adhesives bonding the jewelry together.
Use a baby toothbrush to gently brush off the costume jewelry to prevent scratching. You can also pick residue out of encrusted areas with a toothpick. Dry quickly to avoid rusting. Dab the jewelry with a towel or blow dry on a cool air setting.