Isopropyl Alcohol

I had to use it religiously in NY, especially in my tow vehicle............

We ALWAYS got condensation in the tanks, and it was hard to keep them topped off all the time........and once in a while the stinking gas station would give you a nice shot of water too..........

Isopropyl was the gold standard..........it was that, or moonshine........one or the other........and the other just wasn't available.