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Actually the formula that my momma used on windows was one part water to two parts vinegar. That and also using telephone books because as stated about lint content. And as stated clean one way outside like up and down against cleaning side ways inside so one could tell what side of the window is streaked. Iffen you smoke it does take a second effort to get rid of the tar on the window. And also smokers look at that tar and that is what the inside of your lungs look like. After cleaning windows , it is best to use a rain-x application to keep the rain from sticking while driving....Skip...being helpful on a Friday.....