Screen wash concentrated formula is a must during the winter months. Keep your screenwash topped up so you dont run out at a bad time. Classic concentrated formula Makes up to 500 litres Effective in both Hard & Soft water areas Clean solvent formula - no unpleasant smell Resists freezing Will not damage paintwork Directions For Use/Dilution ratios: Summer, Dilute 1:20 parts water - makes 500 litres of screen wash. Winter, Dilute 1:5 parts water- makes 125 litres of screen wash.