Avoid window streaks by using a squeegee, working from top to bottom, avoiding direct sunlight and buffing windows with a chamois after cleaning. A homemade solution of equal parts distilled water and vinegar also helps reduce streaks on windows.
Direct sunlight on the window causes the cleaning solution to dry faster, increasing the potential for streaks. Clean windows on a cloudy day, or wait until the window doesn't receive direct sunlight.
Paper towels often leave streaks and lint on the window. A microfiber cloth is a lint-free alternative. Newspaper is also known as a streak-free cleaning tool for windows. The newsprint won't transfer to the windows, but it may leave black marks on skin.
A squeegee is another cleaning tool option that removes the cleaning solution in one pass. The fewer passes made over the window, the lower the chance of making streaks. A cloth or paper towels helps clean up drips and dry the squeegee blade. If the squeegee stops working well, it may be time to replace the blade.
Suds tend to increase streaking. A solution made from vinegar and water eliminates suds. Most glass cleaners are also suds-free. Using soap to clean windows can leave a sudsy, streaky mess. Use distilled water when you dilute your glass cleaner. This type of water is preferred because it does not have the minerals that are present in tap water that leave streaky deposits on windows.
If some streaks still find a way onto the window, there is no need to reapply window cleaner. Wiping the streaks with a dry microfiber cloth or a chamois helps remove the streaks.