Holts 5 litre screen wash which effectively cleans windscreens with a non-smearing formula. Cleans traffic film from windscreen, leaves no smear or glint cleans the glass effectively. The concentrated formula can be diluted with water and is protected to - 5 Deg C which is ideal for all year round use. The primary purpose of screen wash is to clean the windscreen of cars and other motor vehicles although water can do this it won't have the same effect, use proper screen wash it is formulated to remove the road grime, dead insects and dirt that windscreens get covered in, it also will not gum up the water bottle pump and jets like they would if you use washing up liquid.