It's been a while since I have winterized an RV, but when I did, I blew out the lines with compressed air and then pumped RV antifreeze through them until it came out of each faucet, shower, toilet, and hot and cold lines to the washer/dryer. I poured anti freeze in the washer and put it on the drain cycle to be sure that the pump and drain lines had anti freeze running through them. Don't forget the kitchen sink sprayer if you have one. And make sure the traps are full of anti freeze.
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