Tough water spots

OK, A while back I posted about what you guys/gals used to remove hard water spots from our vehicles glass......I don't think I recieved more than two responses of which one was "good luck"...well, I have found something that works extremely well, Cerama bryte......I was cleaning our GE glass top range with it when it dawned on me to try it on the windshield of my 72 Duster.......used with the correct scotch brite pad (yellow) I had that 40 year windshield looking like new again! Can't wait to get to the rear & side glass....what a difference! D