Tech Tips: RV Antifreeze: Not All the SameI'm like these folks. They verify the alcohol based products will leave a bad taste and is hard on rubber but it's supposed to be less expensive. You have to read the label to be sure what you're getting.
I've used a lot of the poly-polypropylene antifreeze since I first started RVing in the 1970s. Never had any trouble with a bad taste after flushing it out in the spring.
About 10 years ago, like the folks that wrote the article, I started using my air compressor to thoroughly blow out my water lines and never had any problems. Resuming use just means opening the faucets for a minute or two and letting the water run. I use a cup or two of used auto-antifreeze in the p-traps to ensure they don't freeze up.
Works for me, your mileage may differ. As long as your RV is exposed to freezing weather and you use one of these 3 solutions, you won't have any problems. There's only two alternatives. Store your RV in a heated space or take it to a warmer climate.