I have always disconnected the ice-maker line when I know I am finished use for the season. It will self-drain from the fridge to the solenoid, and the solenoid should drain with both sides disconnected. My ice-maker line is also downhill from feed point in basement, so it drains out also when disconnected. Never have used AF in lines after pulling low-point drains, but I live in N. TX, where we don't usually see any below-freezing highs during the winter.
In MI, I would drain, blow everything out, put AF in the traps and cross my fingers.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired