The PIAA Silicone Prep Pack is designed to work in conjunction with our patented silicone wiper blades. The window prep packs clean the street grime and dirt while providing long lasting water beading technology. This beading technology after application will make dirt, water, and grime flow of your vehicles windshield with ease. A clean and smooth windshield will provide the best surface for your premium PIAA Silicone Wiper Blades.