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[Pumilo]

This method can only be used on an empty viv. Muratic acid available from any hardware store or swimming pool supply store. It is a calcium specific acid and strips it off in mere seconds. Take it outside, spritz it on with a spray bottle, and rinse it off. When you spray it on, it foams, when it stops foaming, you know it's done. Rinse it well. It rinses away easily and cleanly. If you miss any, the only danger would be a slight ph change.
We do this for badly encrusted reef tank equipment. Works great for badly encrusted items and it won't attack glass, plastics, or organics. Still, don't get it in your eyes and rinse if you get it on your skin.