All else, you could try using isopropanol - experiment with it in your freezer first though
Isopropyl alcohol seems to be the new "bee's knees" of glass cleaners....everything from Windex, to RainX, now states "Contains Alcohol" "Ammonia Free!" - if it states Ammonia Free it's typically isopropyl alcohol....
BUT, even "off the shelf" pharmacy rubbing alcohol is only 40% alcohol if I recall....but if you ask the pharmacist, you should be able to get 93% alcohol which may work better.
Glad I don't have to worry about that here in FL
I typically add a shot glass or 2 of Simple Green to my washer fluid every fill up....hehe. Seems to get the windshield really clean.
I really should just "pre mix" it next empty jug of WWF I get
BTW, my local WM sells a "Rain X Brand" WW Additive, in a tall-ish rectangular bottle, probably 15-20 oz. or so....I recall looking at it one time. And basically you add a couple ounces to your current WWF....during the winter, they say to "double the dose" to protect from freezing...perhaps try that...?
At my store they got it on the bottle shelf, right below the windshield wipers....
But wow, @ GA laws: that's some hogwash there....they should easily be able to use Alcohol instead of Antifreeze...as a substitute. Only problem I suppose, would be alerting the WWF manufacturers of this "new" law, and see if they can adapt their formulas to the change.....
I think the PEAK blue just uses some kind of methanol of sorts, to increase the freezing point (err...lower it? Lol..whatever, stop it from freezing).
http://66.194.55.176/walmart_public/view...amp;ismsds=true has the Rain X additive I was referring to, it's
2-butoxy ethanol 111-76-2 1.00 - 5.00 %
Isopropyl Alcohol 67-63-0 1.00 - 5.00 %
Methanol 67-56-1 < 4.00 %
And yea, basically rubbing alcohol, methanol (to further hinder the freeze point), and the 2-butoxy ethanol is one of the latest "Multipurpose Cleaner" ingredients found in [censored] near any Degreaser; Purple Power, La's Totally Awesome, Super Clean, Simple Green, etc.
But if you're in the north, I'd test it in your freezer, or even outside your front door over night, and see if it freezes over night before putting it into your WWF tank.
But I know the RainX product I was referring to, basically the more you add to the tank, the higher the freeze point.