How can I get rock-hard lime deposits out of my toilet?

Becky
by Becky

Our water is extremely hard. There are rock-hard lime deposits a few places in the bowl. I have used toilet bowl cleaner for lime, CLR, I soaked pieces of paper towel in vinegar and left on overnight, and I have worn away half a pumice stone. I want it gone!! Any suggestions? Thank you so much!

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