4 bottles of 40ml / 1.35 fl. oz. Genuine Mercedes-Benz Windshield Washer Fluid Concentrate.
This is a windshield washer fluid concentrate and mixes with 1 gallon or 4 liters of water, preferably distilled water.
We have used this for years and it is the best we have used, and when mixed with distilled water leaves no streaks, does not have that nasty smell of premixed stuff, and cleans better than any cleaner we have ever used.
This is Summerfit and is not recommended for areas that freeze, unless you have a heated washer fluid tank.