First I open all the spigots to center position to open hot and cold including shower, outdoor shower, and ice maker. Then open the low point drains and drain everything including the water heater plug and black, grey and fresh water tanks. While all this is draining I remove the under sink filter and take the drain plug out of the instant hot water heater.
In the coach turn the winterize switch to on, hot water bypass switch to on, make sure the antifreeze tank is full, close all valves, spigots and drains, turn on water pump and then one at a time pump antifreeze through each one both hot and cold. then turn on clothes washer and cycle with temp set to warm so both hot and cold valves open and run until antifreeze enters drum. Set washer to pump out the antifreeze and let it cycle to off. Shut down water pump and refill antifreeze tank and you are finished!