Imagine a windshield cleaner that cleans the glass, conditions the rubber in your wiper blades, and is concentrated so you won't need to use too much product. Now pick up a bottle of P21S Windshield Wash Booster and you've got a product that does everything I just described. This wash booster cleans the toughest grime such as bug guts, road film, dirt, pollen, etc. from the surface of your windshield glass. The handy measuring reservoir allows you to add just the right amount of product to your wiper fluid tank. Another effective and economical product from P21S.