Shower cleaning hard water , very stubborn marks - have borehole water
lf else fails, use a pumice stone to remove the mineral deposits from the water.
Put a filter on the water line running from your borehhole to the house. Specific filters are made for just your problem.
Hi D, here's 5 ways to clean those hard water staines - https://www.wikihow.com/Clean-Hard-Water-Spots-Off-Windows
CLR spray --- Calcium/Lime/Rust remover -- available in many hardware / home supply stores, or kitchen/bathroom cleaner areas of a grocery store