Decosol excel screenwash keeps vehicle windscreens in top tip spotless condition just use less fluid and more water to get a good ratio mixture making anything up to 25 litres per bottle this is especially desired in colder climates where a thin layer of ice or frost accumulates on the windscreens surface eliminating the need to manually scrape the windshield or pour warm water on the glass decosol screenwash also has a non smearing formulation additive to keep the screen squeaky clean and free