ORIGINAL: RoswellGrey

The best thing I've found is to go to Walgreens and go to the section where they sell eye-care products. They sell little moistened towelettes that are supposed to be used for cleaning eyeglasses. (It notes on the box that they also can be used for computer screens.) I always use a couple of them to finish off cleaning the windows after I have used Windex and paper towels. The little towelettes get rid of the streaks and any residue from the paper towels. Also, never try cleaning the windows if the car is sitting out in the sun. Do it in the shade or in the evening when it's still light enough outside to see what you're doing.