You can also use a high speed buffer with some Work Out it is a 1500 grit cleaner used by prof. detailers. We have some here at the dealership I work for and I have cleaned all of my tinted windows with it as well and the windshield and it will not scratch but will remove all of the water spots. You can also use the red rubbing compound it will take longer and your arm will fall off but that will work too.
2002 Liberty. 2wd. 17in American Racing wheels/ 235/65/17 Michelin MXV4 Plus, Chrome Grill, Borla cat-back exhaust.