Winterizing Washer Plumbing on 2011 3250TS

We have to winterize our 2011 3250TS. I use the liquid RV antifreeze (pink lemonade). I know how to do it in general, but I don't what to do about the hot/cold washer pipes in the closet. We don't use the washer hookup. Will I have to pump the antifreeze up through the pipes and bleed the water out from inside the closet? If yes, I hope I can do it without making a mess. Any suggestions?

Pappy

2011 Big Country 3250TS
2010 Ford 250 Diesel Supercab
Firestone RideRite rear air bags

I have a 3' lenght of hose with a female fitting on it. I attach it to first one, then the other washer hookup and pump anti freeze into the drain pipe that is in the closet.
Doing it that way will protect the P-trap as well.
No mess doing it that way.

Peace
Dave