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@AdamsPolishes has a water spot remover. I haven't used it myself but their other products have worked really well for me.
My soon to be son-in-law gave me about half a bottle of this stuff before he moved and I haven't tried it yet but he said it worked great for him. I'll be trying this out today to see how effective it is on my hard water spots. My neighbors sprinkler system blows over onto my truck when the wind blows (which is often). It's not the "full water stream" but more of the mist but it's steady for about 5 minutes so it gets it pretty good most of the time.i use the chemical guys hard water removal (https://www.amazon.com/Chemical-Guys-SPI10816-Heavy-Remover/dp/B01N2G2NEJ/ref=sr_1_5?crid=6J86OCGBTQW1&dchild=1&keywords=chemical+guys+hard+water+spot+remover&qid=1625326806&sprefix=chemical+guys+hard,aps,216&sr=8-5) it works great.