🟢 SUMMER MIX — makes about 4 L
3¾ L water
½ cup white vinegar
1 teaspoon liquid Castile soap
Optional: 2 drops blue food colouring
Gently tip the jug to mix—don’t shake it into foam.
❄️ EXTREME WINTER MIX — rated roughly to −50°C
3.6 L of 99% isopropyl alcohol
400 mL distilled water
1 teaspoon liquid Castile soap
Optional: 2 drops blue food colouring
If using 91% isopropyl alcohol, use it essentially straight—about 4 L—with only the teaspoon of soap. Do not dilute it with water for serious Canadian cold!
Important correction: 70% rubbing alcohol is not reliable for −50°C when mixed into washer fluid.
Stop using toxic windshield washer fluid. Learn how to mix your own safe, effective homemade washer fluid solutions in minutes.Commercial windshield washer fluid often relies on methanol, a chemical that poses health risks to users. This guide is for car owners who want to avoid those dangers and save money by creating simple, effective alternatives at home.
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