Windshield Washer fluid alternative

no no…oily mess on windshield

I would avoid hardware store denatured alcohol. It’s about 90% ethanol but to make it non-drinkable they add things like methyl ketone and acetone, which could damage your paint. Look for methanol or isopropyl alcohol. You probably want somewhere between 50% and 70% methanol or isopropyl with the balance being water and maybe a drop of detergent. Or take commercial -40 windshield washer fluid and dilute it 1 to 1 with 90% isopropyl or methanol.

Isopropyl works the best, we used to use it as a washer fluid booster on trucks when venturing into 40 below territory. A 12 ounce bottle to a gallon of 25 below washer fluid.

Nice…Thanks Oldtimer