Our window cleaning service uses 100% pure water to clean your windows, as this is scientifically proven to be the best method of window cleaning. Have you ever hosed down a window on a sunny day, only to find that once dry, your windows were now covered in white spots and smears? Why was that? The reason is that Tap Water contains many impurities such as calcium, phosphates, nitrates, sodium, potassium and chloride. It is these impurities that remain on your windows, leaving unsightly marks. To produce Pure Water we take tap water and filter it extensively until all of the impurities that leave those unsightly spots and smears on your windows, have been removed, leaving de-ionised (100% ultra-pure) water.