Anything over 10% would have to be labeled Flammable. It may be that some of them use less percentage and therefor avoid being labeled flammable. But this might only mean they are 9%. Not that they are devoid of it.

I would not think a Glycol base good for a windshield as it is oily and would simply smear and not evaporate off.

I would think a solvent like an Alcohol would do both nicely. Evaporate and prevent freezing. Plus it does mix with water very well.

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1983 300D-Turbo - Deep Blue w Palomino MB Tex (total loss in fire 1/5/09 RIP)
1995 E320 W124 Polar White/Grey Mushroom MB Tex
2005 F150 Supercrew - Arizona Beige - Lear topper
1985 Piaggio Vespa T5 - Black and Chrome

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