Mix dish soap, vinegar, isopropyl alcohol and water in a clean gallon jug to make homemade windshield washer fluid. Add blue food coloring to remind and warn you of what the fluid is.Continue Reading
Gather a clean, empty gallon jug, clean water, dish soap, vinegar and blue food coloring.
Pour one gallon of clean water into the gallon jug. Add 1/2 cup of vinegar and a tablespoon of dishwashing soap.
Adding blue food coloring is optional, but is a good idea to remind you of the contents of the jug. Add a few drops of food coloring into the mixture or until the desired color is achieved. Recap the bottle and shake to ensure all the ingredients mix together.
Leave the homemade windshield washer fluid outside overnight to see if it freezes. If partially or completely frozen, wait for the ice to melt and add a cup of isopropyl alcohol. Leave the fluid outside again, and check to see if it freezes. Add alcohol, repeating the process until the windshield washer no longer freezes.
Pour the windshield washer fluid into the windshield wiper reservoir and store the remaining fluid safely. Keep the fluid away from children and pets.