Decosol ad25 excel screenwash decosol ad25 decosol excel screenwash keeps vehicle windscreens squeaky clean and free from road grime and bugs with the added benifit of not freezing at temperatures down to minus 24degc when used neatdepending on your local conditions the screenwash can be diluted with water making anything up to 25 litres from a single 500ml bottle decosol ad25 excel screenwash 500ml