Adding stuff to windshield washer fluid: Good idea or not?
Windshield Washer Fluid | Make Your Own Windshield Washer Fluid
Windshield Washer Fluid – Can You Make It at Home – Newparts.com
Dr. Bronner's - A simple recipe for windshield wiper fluid using our Castile Liquid Soap: in an empty 1 gallon jug, combine 1 oz. of soap with 8 oz. of isopropyl alcohol,