The first step to cleaning car windows is a good car-glass cleaner. Glass cleaner cuts through grime to create a streak-free crystal-clear window every time. The ease of use of Crystal Clear makes it top of the list as one of the best car window cleaner options on the market. Crystal Clear can be used on the interior and exterior glass parts of your car’s windshield and other windows. Plus, its super easy to wipe off using a clean microfiber towel – leaving zero streaks behind.