Congrats on the new MOHO. If you have the Splendide W/D they also provide directions to winterize it using the normal fill lines. This is the preferred method, because as you identified, it flows the antifreeze through the hoses and solenoid valves/tubing within the machine.
Regarding the icemaker, if you have the typical RV frig with the solenoid located in the access panel, I have found the easiest method is to remove the plastic tubing from solenoid to the freezer and let it gravity drain. Then you can either remove the supply line to the solenoid until the pink stuff flows out or in my case, I made a cheater cord with the same push on connectors so I simply connect the cord to the solenoid and plug it in until the antifreeze comes out. The little water in the icemaker tray will not hurt anything and will most likely evaporate. Good luck.
Lou
05 Travel Supreme Envoy