Natural Homemade Windshield Washer Fluid Recipe

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Homemade Windshield Washer Fluid

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

Are you ready for a little disclosure? I have a secret obsession with car washes. Although you wouldn’t know it by looking at my dirty car, I’m always scoping out car wash locations with the best coupons/prices, the best pre-wash, the coolest scrubbies, the friendliest employees, free vacuums, and a guy at the end who buffs your car dry at no extra charge.

My family noticed this obsession long before I was willing to admit I had a problem.

I’m in recovery now, so I try to focus just on my windshield. (Ok, not true, but I had to segue into the windshield issue at some point.)

Lately, we’ve been running out of windshield fluid in our cars every few weeks. In the South, we have a perpetual layer of yellow dust all over our cars.

I’ve recently been informed that the area we moved to has one of the country’s most consistently high pollen counts. True or not, I look like I’m leaving a trail of magic fairy dust behind every time I drive away.

Since I need to be able to see the road when I’m dusting the town with my special fairy blend, I make my windshield washer fluid. It is cheap, non-toxic, and can be used to clean other things.

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
1 gallon
Estimated Cost


  • 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.

Made this recipe?

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Why Make Homemade DIY Windshield Washer Fluid?

  1. Commercial windshield washer fluid is poisonous – They make it with methanol, which the National Institute of Health lists as poisonous alcohol that can cause significant damage even in small amounts.
  2. Homemade is much less expensive – Stores in our area list a 16 oz. bottle of rubbing alcohol at $0.88, a 32 oz. bottle of Dr. Bronner’s castile soap at $13.00, and a gallon of commercial windshield washer at $3.16 per gallon. This calculates to a cost per gallon of around $0.90 for our recipe versus $3.16 for the commercial brands, a savings of more than 350%.
  3. What are your reasons? Don’t limit this to my imagination, leave a comment with other creative reasons to make your own.

After you make this maybe you should try to learn how to make liquid soap.

How did you like making homemade windshield washer fluid?


References and Resources

About Betsy Jabs

Betsy holds a bachelor's degree in Psychology and a Master's degree in Counseling, and for nearly a decade worked as an elementary counselor. In 2011 she left her counseling career to pursue healthy living. She loves using DIY Natural as a way to educate people to depend on themselves to nourish their bodies and live happier healthier lives. Connect with Betsy on Facebookand Twitter.

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DISCLAIMER: Information on DIY Natural™ is not reviewed or endorsed by the FDA and is NOT intended to be substituted for the advice of your health care professional. If you rely solely upon this advice you do so at your own risk. Read full Disclaimer & Disclosure statements here.


  1. Roger says

    Thanks for the tip! I will give it a try as I think it’s better to have things on hand (like the castile) to make a variety of things. So far, we have enjoyed the recepies from your website. My favorite is Matt’s shower routine which I have adapted some of the techniques. Keep posting even the most trivial things that come to you both – it’s interesting reading. Have to ask – why don’t you use car wax? Thanks!

    • Betsy Jabs says

      Good to know you enjoy even the simple articles! 🙂 We don’t have anything against car wax, we’ve just never used it. Our cars have always looked great without it.

  2. Claire says

    Hi! I love your site and use your tips all the time. Thank you for posting all the helpful information!

    I have a question about using castile soap. Is there a reason to use this type for the washer fluid or can any liquid soap be substituted?

    Thanks again!

    • Betsy Jabs says

      We use castile for everything because it’s very natural, but you could use another type of liquid soap. Other types of liquid soap tend to suds up a little more than castile though, so you may want to try it first using a little less liquid soap if you’re using something other than castile.

  3. V Pacific. INC says

    I am in colder climate and using 90% rubbing alcohol comes out to $7.30 for the Rubbing alcohol alone. I use 2 gallons a week. plus the other stuff. I get -40 washer fluid for $ 1.50 a gallon at Home Depot by the case loads.
    Thank you but no thanx. Your recipe is WAY to exp for us that need something that require below freezing point.. Like -40

  4. TuttPutt says

    DO RESEARCH BEFORE USING VINIGAR IN WINDSHIELD WASHER. Vinigar is acid and may damage rubber and other windshield washer parts. I think I may have read this in one of my old Honda Manuel’s, not sure it’s been so long ago since I read it. May not be a concern today because of possible improvements in parts. Don’t know if windshield whispers are still made of rubber or not.
    Also, rain x washer fluid did not work in my Acuras and Hondas. It left dangerous streaks that made it hard to see, specially at night. Had to use mineral spirits ( I called Raiin X) to get it off. They told me is dowse not work on all shapes of windows and builds up because some blades do not press down hard enough, or are not sharp enough.

  5. Tyler says

    The best and easiest way to make your own windshield washer fluid is to buy the qwix mix concentrate. There is no messy mixing of household products and certainly not a page and a half of instructions. All you need in to buy a gallon of biodegradable concentrate for $8 which will make you 500 gallons, mix a few drops per gallon of water and your done, add alcohol if you don’t want it to freeze. You can purchase this from their website at

  6. Stephen says

    Wow a savings of 350%! This means I make more money than I spend.
    You cannot save more than 100% of the cost of an item.
    Its a cost savings of (1-.9/3.16)*100 ~= 72%.

  7. IlaWoo says

    I am so happy to find this recipe for windshield wiper fluid. I am appalled at how expensive this fluid is. I will be making this very very soon. Thank you, very much…

  8. Trevor Arnold says

    It’s a good thing that you pointed out why the rubber alcohol or the vodka is added to the mix. It’s essential for the car to prevent the homemade windshield washer fluid from freezing during the winter. The post and the blog are great! I stumble upon it by accident but it definitely caught my attention. 🙂

    All the best!

  9. Ivan says

    I sure could really use this for my windscreen replacement business. Imagine the savings I will have from buying those costly cleansers.

  10. SteveR says

    Don’t use this recipe if you live in a cold climate. Rubbing alcohol produces a much too high freezing point. You’ll need to use methanol.