A facility manager for an office building recently asked one of our area developers to help get rid of the hard water stains that were on the tile in their gym shower.
The area developer showed up one evening to get the job done. He tried 3 different cleaning chemicals that night. None of them worked. He left defeated.
He regrouped and came back the next night. This time he came armed with vinegar. More specifically, he made a paste using vinegar and baking soda. He rubbed the paste on the stained areas and then let it sit. After a few minutes he rinsed off the paste with a shower spray and amazingly the stains were gone!