You do not need to do anything to the refrigerator. Just make sure it is wiped down and dry before you close it. What you need to do for winterizing is drain all of the water out of the tanks, water heater and lines. After that is done then pour RV antifreeze into your fresh water tank and pump it through all of your faucets. Once you see the pink color come out then you have it through the lines. You should have what is called a bypass valve for your water heater so you don't have to fill it completely with antifreeze. Next is to take out your battery and store it in your basement or somewhere it wont freeze. Do not put it directly on the ground. Put cardboard or something under it.
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