I would search for a 'hard water spot remover' product. I can't make any recommendations as I wouldn't want to point you to a product that doesn't end up working for you (I would feel terrible about that)

But search around, find something that you like, and if it doesn't end up working, Amazon has excellent return policies in place. You should have no problems finding one that works :)

Here is a quick link below for some products that might work for you.

https://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=hard+water+spot+remover