How do you get hard water stains out of granite countertops and sinks?
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lime away or clr, works good on hard water stains
Here is a link to someone here on Hometalk who has dealt with this - maybe their tutorial will help you - https://www.hometalk.com/diy/clean/house/q-hard-water-stains-in-granite-sink-6052674
Hard water stains in granite sink
I just did it two days ago with a lemon slice. It was very bad so I did not try to get it all at one try, but it was easy. Learned that trick on this website, Hometalk. You should see how beautiful the faucet assembly came out!!!