Sterling silver jewelry is the most affordable for any budget .. & is very easy to clean  ...

You can either buy special chemical for it ....... OR ... use my cheap method :

* Take a used tootbrush and small amount of tooth paste (any tooth paste will do) and clean your jewerly with it .... it will shine right on ..

* If it still doesnt give you the original look you want, let the jewelry ( not watch ) soaked on the tootpaste for couple minutes and wash them .... cold / warm water will do ..

Hope this is helpful ~