Winterizing Residential Fridge:
I didn't want to put antifreeze through the system so I did the following.
First I shut off the water at the valve feeding the line to the fridge.
Then I disconnected the line at that valve. Through the outside door on the Rv there is also a disconnect which I disconnected and blew the water out of that line.
I then got the wife to depress the lever and pump out all of the existing ice from the ice maker. Then I had her continue to depress the lever which opens the water inlet valve for the ice maker and with the air hose blew the water up the other way to clear the valve of water so nothing to freeze.
We left it dry and use regular ice cube trays that worked well for 50 yrs.
We find the ice maker made ice but not quality cubes anyhow.
On the other hand if I decided to use we wouldn't spend half the winter trying to get non antifreeze tasting ice.