Riobel-Gel Gloss

Cleaning thoroughly a half warm water and half vinegar solution is the recommended cleaning method. The product Gel-Gloss can also be used to help removed hard water stains. Not only does this product help to remove the stains, it protects the finish.

Apply a coat of Gel-Gloss over with a soft cotton cloth and work it well into the faucet.

This product does small miracles.  

Here is picture of the Gel Gloss bottle. It can be found in any big surface store, Wal Mart, Home depot etc.