Winter Windshield Washer Concentrate in a 55 gallon drum is 72% methanol with blue dye which provides freeze protection. This Windshield Washer Concentrate can be diluted to meet desired freeze protection needed for De-Icing and Defrosting. For automotive washer fluid needs, 1 drum can be evenly blended with with water to make 2.5 drums which will provide freeze protection down to -25 F.