Calcium removal.

Kieserite blasting is best.

If minor, you can use a dilute muriatic acid and a scrub brush. Proper PPE is needed.
 
I know your looking for options other than media blasting, but the the thread below has some good info on calcium scaling and removal options. I paid $4.00 per linear foot for glass bead blasting and believe it was well worth the cost. Good luck!

 
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