Hm I guess if you use hot water and baking soda, and let it soak, it should work, based on what the sources say, about 1 cup of baking soda per gallon of water, and some salt. This is just for silver jewelry.

Get a container, line the inside with foil, and put the jewelry down in so that it touches the foil, add water, 1 cub of baking soda per gallon, and somewhere between 2 tsps and 2 Tbsp s of salt.
Source(s):
http://chemistry.about.com/cs/howtos/ht/silverdip.htm

http://scifun.chem.wisc.edu/homeexpts/tarnish.html

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Get it done professionally. Once you try to remove it yourself and you get it all shiny, it starts to tarnish again. I messed up 2 pairs of earrings and a Tiffany's bracelet.
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Research carefully! The methods used for ONE metal (e.g., gold) will provide poor results with another metal (e.g., sterling silver). I don't have the methods documented at hand, at the moment, so I know I won't get your points, but I just wanted to give you the warning!
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Since, you have not mention what types of jewelry you have. I will help you with the cleaning tips for gold jewelry as I am following the same process for cleaning my gold jewelry.

Cleaning your Gold Jewelry you need to soak your gold jewelry in a mild detergent and warm water solution for 1-3 minutes. Avoid chlorine and ammonia as both can discolor the metal. Remove and gently brush the jewelry with a soft toothbrush or jewelry brush to remove any remaining grime. Now carefully rinse the gold jewelry in warm water to remove the detergent solution. Next thoroughly dry the gold jewelry with your cloth, any remaining moisture will dull the shine of the gold.

Hope this will gives you a clear idea and prevent you from making extra costs for cleaning.
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