Safe way to remove hard water deposits?

[twistedfinn967]

IF you use muriatic acid be VERY careful. Make sure you wear rubber gloves and goggles. I've used it (muriatic acid) to etch concrete before. Do not take it lightly.

 

[bullwinkle]

another vote for vinegar

 

[Wajrhall]

Vinegar did the trick, I soaked some rocks in half vinegar half water and it completely disolved the calcium in about an hour. A quick rinse in clean water, there was no smell, and the rocks looked as clean as the day I collected them.

This is one home remedy that is 100%

Thanks everybody!