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Vinegar may also work as well.
If you have hard water you may want to consider a water softener for the house.
Be careful not to use abrasive cleaning pads on the surface. This leaves micro scratches on the surface which will trap even more of the water hardness byproducts. Making it more difficult to keep clean.
Once you have removed this film from the sink, you may want to consider having the sink professionally re-polished by a granite company to make it smooth and shiny once again.
You should also consider sealing the granite top and sink as well. As the sink and top go through many cleanings the top begins to loose some of the prior sealing that was done once it was installed or polished at the factory. Any good tile store or counter supplier can provide you with the necessary sealers in which to use for the granite top you have.