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Homemade Windshield Washer Fluid

Homemade Windshield Washer Fluid: Non-Toxic

Homemade windshield washer fluid is a simple, inexpensive, and natural DIY recipe. Ditch the commercial stuff, save money, and make your own!

Prep Time 5 minutes
Active Time 5 minutes
Total Time 10 minutes
Servings 1 gallon
Author Betsy Jabs


  • 1 empty and clean gallon jug
  • 8 ounces 99% isopropyl rubbing alcohol (double this amount in extremely cold weather)
  • 1 ounce liquid castile soap
  • 4 drops blue food coloring (optional)


  1. Pour the rubbing alcohol into the empty jug then fill the jug with water, leaving room for the soap.

  2. Slowly add the soap and optional food coloring to the jug.

  3. Cap the jug and gently tip upside down a few times to mix ingredients.

  4. Pour windshield wiper fluid into the correct compartment under your car hood.

Recipe Video


If you live in a colder climate, be sure to use 99% isopropyl alcohol to prevent the washer fluid from freezing.

Homemade Windshield Washer Fluid Tips

  • Use this wiper fluid to clean the rest of the windows in your car or your home.
  • It also works great to clean countertops and shine faucets!
  • Always remember to label your homemade concoctions.
  • The alcohol will keep this from freezing, for stronger anti-freeze protection in severe cold weather, add more alcohol.
  • Old gallon jugs from vinegar make the perfect container for storing your homemade windshield formula.

A Note on Car Wax

Isopropyl (rubbing) alcohol is used to remove car wax at a ratio of 1:1 (1 part water to 1 part alcohol). This homemade windshield washer fluid calls for a dilution of 16:1 (and 8:1 in extreme cold), so it should not have any effects on the wax. That said, we recommend testing this on a small area before pouring solution in washer reservoir and using.