http://www.pilkington.com/en-gb/uk/products/product-categories/self-cleaningSelf-Cleaning Glass Pilkington made a significant step in the glass industry with the development of Pilkington Activ™, the first dual-action self-cleaning glass.The unique dual-action of the Pilkington Activ™ coating uses the forces of nature to help keep the glass free from dirt, giving not only the practical benefit of less cleaning, but also clearer, better-looking windows.