I used Diamond Magic Stain Remover and it took a little off but not completely any recommendations???
Try OneRestore, works great. Much success!
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Use a scouring stick (pumice stone) make a paste with some of the dust from it and water
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I first apply Kaboom Toilet Bowl cleaner to take the majority of the calcium off. Next I use a corner sander with a walnut or scouring pad and Cerma Brite as the lubricant/polish compound.