Hard water spot and stain remover

Do you have hard water spots on your windows? Since having my windows tinted, it makes all the water spots completely visible. Chances are you do, and they will not come off, and are a royal pain. Ive found two products that get rid of them, both are acid and chemical free, so you wont die if you use it lol, but its not easy, it takes some old fashion "elbow grease". Spot-x hard water stain & spot remover website here: http://www.spot-x.net/index.html and Glass stove top cleaner with one of those special yellow pads. You have to use one of those pads so you dont scratch the glass.