Applying a hydrophobic film on the glass helps smooth out its surface and remove water and dirt from it. This solution was originally used in the aviation industry and is related to nanotechnology. In short, it consists in covering a glass with particles which smooth out its surface to make it self-cleaning as water and dirt slide off it as you drive. This solution significantly increases the comfort of driving at high speeds. It also helps reduce the wear of the wiper blades and the amount of the windscreen washer used.