Making homemade windshield washer fluid can save you money; make sure you use ingredients safe for the hoses, etc. This is a guide about homemade windshield washer fluid.
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The kind of commercial windshield washer fluid that is so convenient to buy at the store contains methanol. Methanol is extremely poisonous and is dangerous to breathe or touch. Less than a half of a teaaspoon can cause blindness and less that two ounces can kill a person.
On top of the dangers to the people using it, it causes environmental damage, by leaking onto the ground when we spray our windows with it. It also gets into the air as pollution. Billions of gallons of this washer fluid ends up in the environment every single year.
Here are directions for making your own windshield cleaning solution fluid.
Shake this all up in a jug, and then let the bubbles go down and pour into your windshild washer fluid canister to the fill line. Please mark the container with the ingredients so it will be easy to remember how to mix it up.
Another mixture is the following for during the times when you don't really have freezing weather to deal with:
By Robyn 
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Here are questions related to Homemade Windshield Washer Fluid.
I am looking for a formula for warm weather windshield-washer fluid. Can anyone help?
By Lilac 12/07/2011
Where your car is concerned you are better off buying something that is made for cars. Go to a discount store and get something inexpensive and buy several jugs. It's ok if it is for winter use, the only thing about it is that it won't freeze. Get it on sale and you will have enough to last through the winter which is when you use the most.
When I used the windshield washer system on my car last winter (ice condition weather), the water on the windshield became ice very soon. Now what kind of alcohol can I mix with water and at what percent?
By Mori from Tehran
By Terry Houghton11/15/2011
I find methylated spirits does the trick for my windshield washing as to what strength just keep trying till you find the right mix our winters here in the UK are not as harsh as the USA.
Will adding Dawn dishsoap to the windshield washer fluid help cut the winter grime from windshield? How much do you add?
By Papa from Blackstone, MA
By Ginnee 01/31/2011
Be sure to clean the wiper blades themselves to get a nice clean windshield.
I need a good, non-streak, washing liquid for the windshield of my car. Not for the windshield washer, this is so I can wash the inside and outside of my windshields and not have a film or streaking.
By Mary from Irvine, CA
By Louise B. 08/19/2010
For the outside, just use water, or dish soap or Mr. clean or similar in water and a squeegee. For the inside, I use Windex and a towel.
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Makes one gallon.
Optional: You can add some blue food coloring if you like!
Be sure to label the container as this will be toxic for the little ones.
By the wisdom
Does anyone have a recipe for homemade soap for windshield washers?
Does anyone have a "recipe" to make your own freeze-proof windshield washer fluid?
By Sheila from Springfield, IL
What I do is take a gallon jug, add water until its about 2/3 full. Then I add any kind of window cleaner. I open the window cleaner and pour some of it in. If it's winter time and you are afraid of it freezing, add a bottle of some type of rubbing alcohol. I only add the Windex so it's blue.
You can just use rubbing alcohol and mix that with water. Most rubbing alcohol is about 70 or 80 percent strength. So personally I would add say 16 ounces to 48 ounces of water and mix. The whole purpose of making it yourself is to save money over buying it, so keep that in mind. (02/22/2010)
I am looking for a homemade car window washer recipe.
By drmegumi from Albuquerque, NM
Vinegar will help keep windshields ice and frost free. When a car has to be left outside overnight in the winter, coat the windshields with a solution of 3 parts white distilled vinegar to 1 part water. A good tip for frost free windshields is believe it or not shaving cream. Rub it in good and wipe off when it starts to fog up, then reapply. You can also use the above tip with alcohol instead of vinegar; I like the green kind best. (04/08/2010)