Been playin games for the last few months tryin to get these extremely baked on water spots off my drivers side windows and windshield. Tried steel wool, polish, compound, vinegar, and god knows how many hacks to get it off. After all of that they still remained however, nowhere near as bad. Finally my boss offered me a solution... Barkeepers friend found at Home Depot. It’s actually a glass top stove cleaner in a liquid form just apply with a good cloth and rub in. All my other products were used in only one window and still did mediocre work. Barkeepers though cut through the worst spots in a fraction of the time on previously untreated windows. Had to post this up figuring I could save someone the problems I had. It even worked on the mirrors which I was sorta sketched out by. Good Luck! I’m not responsible for possible scratches or damages that arise from this. I had no damage at all but I will not be held liable if you do!