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I haul methanol and PG into these places a lot, usually different times of the year they change or adjust the formula more PG or more methanol.
RV anti freeze IS PG you could probably add some to your regular fluid, more methanol will "haze" the windsheild a little when you squirt it, but otherwise won't do any harm.
I use the spray deicer in the spray can, usually works instantly, and doesn't re-freeze.
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2002 F-350 SC SRW long bed 4X4 7.3 PSD Auto, Island blue,
38 Chev sedan delivery all steel, 350, TH400,A-C PW PS PDB, Yellow,
2000 Kenworth W900 600Hp Cat 18 spd 3:70 green
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