Muriatic acid
Works unbelievably well on calcium build up. Use a mild solution and have a dousing pail of water to stop the reaction. I have used muriatic acid to clean carbs that were garbage , using an eyedropper to place the acid on the calcium. Be forwarned that it will dissolve the aluminum , brass the works if you let it work too long. But it cleans up a carb in a few minutes I just replace the jets and other fittings with a kit if I can't remove them beforehand.
Just remember A&W ACID TO WATER, NOT OTHER WAY ROUND.
Sean
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