Without a doubt, the best window cleaner is a professional squeegee. Unlike other methods, such as using paper towels or newspapers, which can leave streaks and lint behind, a squeegee will give you a streak-free finish every time. Plus, it’s much quicker and easier to use than other methods, so you’ll save time in the long run. *This information was given to us from our friends at Professional Window Cleaning in Tempe AZ.