take a special cloth or silver cleaner and gently rub the tarnish away. do not use bleaches or ammonia, as this will increase tarnishing. if u dont have a special cloth try the microfiber cloths used to clean glasses or to polish instruments.
Mix salt and vinigear, and soak it in. But if its valubale, DO NOT USE TOO MUCH SALT.
Dip it in Coca Cola I'm serious it really works!
Tan-x or any jewelry polishing cloths you can buy on ebay
I haven't seen vinegar clean jewelry but I saw my girlfriend clean my tarnished earrings with toothpaste. I was amazed.
Tarnished silver jewellery can be cleaned by wrapping it in aluminum foil, then placing it in a bicarbonate of soda solution.
There are two levels of clean when talking about sterling silver jewelry. The piece of sterling jewelry could be either simply dirty or tarnished or both. If the piece is only dirty a solution of Mr. Clean, water, and ammonia can be used. Mix half water and Mr. Clean with a small amount of ammonia. This is the same solution many jewelers I know use in their ultrasonic to clean all types of fine jewelry. Allow the jewelry to soak for 15 seconds then rinse with water and dry. You can repeat if need be. More likely than not sterling jewelry is also tarnished. Sterling does tarnish much quicker than gold or platinum. Removing tarnish from sterling silver jewelry is easy. Mix just enough water with baking soda to make a paste and use the paste to rub on the jewelry to remove the tarnish. Rinse with water then dry.
http://home.howstuffworks.com/how-to-clean-furnishings3.htm
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A polishing cloth works great to remove tarnish from white and yellow gold. To clean gold jewelry use a solution of half Mr. Clean and water with a small amount of ammonia. Soak for 15 seconds then rinse with water and dry. If the white gold ring has a yellow tint, you may need to bring the ring into a jewelry store to have it rhodium plated again.
you use baking powder and coke
It might do a good job, it is a time-honored household cleaner. It might not help much at all, either. But at least you can be assured that baking soda as a cleaning agent cannot possibly hurt the costume jewelry.
One suggestion is Lemon or Lemon rinds
To clean all types of jewelry including fine jewelry a solution of half Mr. Clean and half water with a small amount of ammonia is the best. This works just as well as jewelry cleaner and is what many jewelry stores use in their ultrasonic. Allow the piece to soak for 15 minutes in the solution then rinse with water. If tarnished sterling silver jewelry is to be cleaned, a mixture of baking soda and water can be used. Mix just enough water and baking soda to make a paste then rub the paste on the sterling silver. Rinse and dry. I have seen other solutions used including toothpaste on inexpensive jewelry, but toothpaste is abrasive and I would not use this on any jewelry worth anything.
Rubbing it gently with sodium bicarbonate.
The acid in the drink gets into the tarnished or the dirt particles and will clean it but you might have to leave it in for a few days.