Improved water stains somewhat (photo)
12 year old black granite countertop developed white rough spots that would not clean.  Advice from local granite dealer was to seal and polish using Rock Doctor before doing repair. We tried it and it helped somewhat, as you can see from the before and after, but it's no miracle worker. The sealer seals and the polish polishes but it did not restore our stone to its former glory.
Rating: 4 stars