Does your RV Antifreeze contain Ethyl Alcohol?

Even if you use the stuff with alcohol in it, it doesn't have to stay in the pipes after you've winterized. I typically pump it through all the plumbing, then drain the remainder out, then leave the faucets open so anything left can evaporate. Yes, some remains in P traps and the black/gray tanks. It'll probably evaporate off too.

Lately I've started winterizing, then immediately un-winterizing. I.E.; setting the water heater bypass back to the "Summer" position, etc.