The hard stuff is mostly calcium phosphate, anything acidic (like vinegar, CLR, hydrochloric acid, phosphoric acid i.e. cola, etc...) will help remove these deposits. Acidic pH swings the equilibrium more in favor of free calcium and protonated phosphate, thus the deposits go away. CLR really works the best, but I do not think you shoul use that in your snake dishes unless you really thoroughly clean it afterward.
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when life hands you lemons, make super lemons, bumblebees, etc...

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