Gold doesn't tarnish, but it can be dirtied or dulled by the oil in your skin, body lotion, makeup or other substances. There are lots of products out there that promise to clean gold, but you can do it easily with mild detergent and a soft cloth.
Things You’ll Need:
-mild dish detergent
-soft polishing cloth
Mix a squeeze of mild dish detergent with warm water in a bowl.
Put the gold item into the soap mixture and let sit for a few minutes.
Use a soft toothbrush to gently scrub the jewelry.
Remove item from soapy water, rinse it and dry thoroughly with a soft polishing cloth.
Tips & Warnings
It is wise to check clasps, mountings, prongs and posts for damage before washing the jewelry. If you find a problem, take the item to a jeweler for repair.
Always be sure gold jewelry is completely dry before storing it.
Never use a harsh or abrasive cleaner, a stiff brush or a scouring pad on gold.
Courtesy – ehow.com