Silver will always tarnish, it's a chemical reaction between the metal, oxygen and sulphur dioxide, sounds scientific but it just the surrendering air and if the air is heavily polluted then the tarnish effect will happen quicker.
There are commercial tarnish removers that claim to restore the silver to it's original state and they probably do, but there are concerns about the toxicity of these products. There are simple, cheap solutions using readily available household products and that are highly efficient. There are variations that I have seen on the web for this recipe and they all apparently work, but the method that i use is the following.
2 tablespoons of baking powder
1 tablespoon of salt
Some aluminium Foil and for good measure I add a some extra pieces of scrap aluminium
2 cups boiling water
Place the aluminium foil in the bottom of a glass bowel or jam jar, put the silver object on the foil ( it is very important that the silver is in contact with the aluminium) mix the ingredients in a separate bowel and then cover the silver object with this mixture and leave for 10 to 15 minutes ( there will be a smell of bad eggs this means it is working as the sulphur is released back into the air) After soaking, remove and lightly scrub the object with a soft toothbrush and rinse.
A after and before photo
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