Winterizing an RV utilizes special RV antifreeze designed to be used in potable water systems. Freshwater, gray water and black water systems
must be drained and also the water heater. The black water tank should be flushed and drained, followed by adding some toilet chemical to prevent odor buildup. Information on this should be included in the packet of papers you received when you bought the rig. This will include items specific to your vehicle, such as water filters, ice makers, etc., which can’t be fully addressed here. Make sure the water heater is drained, and the U-shaped drain traps under sinks are drained and filled with RV antifreeze.
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