Well I wouldn't recommend using straight acetone either, the freezing point is nearly the same so you should be able to use the same amount of acetone as you would methanol (which is about 33% in the -35c windshield wiper fluid), so I would think that used in the same concentration that their flamability would be about the same.
That's interesting about the recycling symbol, I'll have to see if I can find anything about it.
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