How do I winterize the washing machine in my motor home?

On our Splendid I first set the temp to cold and then fill, when I see the pink stuff in the bottom of the drum I shut the cycle off and go to the Drain cycle and then pump the pink out. I then repeat the process with the water temp set to hot. This will fill all lines with the pink stuff. I do this while flushing all the other water lines. For our 40' MH with a washer it takes about 6gl to flush and fill all lines including the residential fridge.