hook up a air compressor and open the pop off valve on the hot water tank. let run till no drops of water and shut off valve, move to the next outlet, sink, shower, kitchen washing machine and do each one and turn off the valves. Washing machine, turn on electrical and let air flow thru . Put one or two cups of antifreeze in each drain and toilet. If you pump has a clear tube attach like most Newmar, then stick that into the rest of the pink stuff and let the pump suck it thru it, Your are finish. Forgot, remove your inline water filter if you have one. 40 lbs pressure should be enough. Cost is time and one gallon of pink stuff. My low points are below each tank and the the refrigerator also has one.
