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I do the air blowing method of winterizing because our unit sits inside a building. I did blow out the black tank flush line just to make sure it did not have water in it while storing it. I could hear the air going into the black tank and the water in the line going into the tank also so I know it was clear. The only time I use the pink stuff is in the traps of the sinks and shower and I also put it in the stool so the gasket does not dry out. It has worked for me for the past few year so I guess I'm doing something right. I do run the water pump to free any water in it also so it does not freeze and split the pump.
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