The most effective weapon against calcium deposits is acid. Before you picture a mad scientist, think of things like vinegar or lemon juice. These are mild acids, perfectly safe for most metal pipes when used briefly, but absolute kryptonite for calcium.
Here’s how it works: calcium scale is basically calcium carbonate, the same stuff that makes up chalk and sea shells. When an acid touches it, a chemical reaction happens. The acid “eats” the calcium, turning it into a soluble, water-soluble compound that just washes away. Poof, no more crust.
It’s like watching a magic trick where a solid disappears into thin (well, liquid) air. That satisfying fizz you hear when you pour vinegar on baking soda? You get a similar fizz when vinegar attacks calcium scale. Science is just cool like that.