I use AF for the coach, just not the ice maker. I just disconnect the water line on both sides of the solenoid. The one to the fridge gravity drains fine. Then I shake the water out of the solenoid. Pump the AF until it comes out the suppy line then shut valve off under kitchen sink. In Spring, after AF is flushed I just connect the supply line to the solenoid. Doing this for years and never a problem. No nasty tasting ice and trying to figure out to get the AF out of the tray.
John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox