Originally Posted By: Reddy45
I think you can get an additive that you put into any fluid to increase the cold temperature resistance.
Denatured alcohol.
A 40% alcohol, 60% water mixture is protected to -20F.
Wood alcohol will do the same thing at a 38%, 62% mix.
Glycerin will also work, but I don't usable in a windshield washer solvent, and it's not as efficient. A 58% glycerin, 42% water mix is only protected to -10F.
Finally, calcium choloride might be used. However, I think you'll wind up with a mess on your car and have to deal with corrosion. A 25% mix by weight will take you to -20F.
Not only is denatured alcohol the common anti-freeze in washer fluids, it's a significant ingredient in Windex and its clones.