How do I clean calcium deposits?

Use CLR

We have issues with this of calcium and other minerals on faucets. Adrienne is right, CLR works great. If you are talking about shower glass or windows, mix a spray bottle of 1/3 dawn dish liquid, 2/3 apple cider vinegar. Mix, spray, give a few minutes then clean with a scotch bright pad.

Kathy: I have good success with Lime Away... soak cloth in it and apply to deposit and hold for a while (wear rubber gloves!)

Don't use vinegar on faucets mounted in granite or marble, as it will "etch" the surface.

I've found vinegar gel, available in a spray bottle works well.