Muriatic acid isn't so dangerous... Gloves, safety glasses and some due care and attention are about all you need when handling the full strength stuff...
1/4 cup into a gallon of water does a REALLY good job at cleaning up the calcium/coraline quickly.
I used to use pure vinegar all the time - got a little pricey, now I just use small amounts of muriatic acid - and get the job done way cheaper/faster.
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