Professional squeegee rubber is imperative in window cleaning. The rubber is important because it comes in direct contact with the glass and dirt. Damaged squeegee rubber is the number one cause of streaks and smears on window glass. To avoid this, pay careful attention to how often you are replacing the rubber blade. The cuts on the surface of the blade and the rounded edge are usually a result of normal wear and tear. This can affect the efficiency of the rubber on the job. Both sides of most rubber blades are usable. Try flipping it when one side gets worn out so you can maximize your investment. Enjoy quality squeegee rubber from brands such as Ettore, Unger, Baron and Pulex. Channels are also available.