This white film is most likely water hardness film. I would fill the sink with hot water and put in a cup or two of Glass Magic dish washing additive. This chemical can dissolve the hard water stains in short order.
Vinegar may also work as well.
If you have hard water you may want to consider a water softener for the house.
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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.
Try denatured alcohol..work quickly because it evaporates quickly. Use a soft cloth and rub in circles. I would also contact the manufactor and check. Denatured alcohol is great for many stains on granite. But still you need to check to make sure this is what they reccommend.
I have used white vinegar on my black granite sink and it does work.. I pour a small amount on a scratch free sponge and wipe the whole sink with it. The smell isn't so good but the sink is black again.
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.