Winterizing the Black Water Tank

I completely clean the black tank with a wand so it is spotless. Drain all tanks. Then winterize with the pink stuff. All tanks are stored dry. Pink stuff is in the traps and about a qt in the toilet bowl. We only use a little water in our fresh water tank while we are moving and as soon as we are stopped for longer than a few days we drain it. Most of the time our Fresh Water tank is dry. I have always figured that any water sitting for any length of time will grow "something" so when stored all tanks are cleaned and dry. We leave the outlets open to the fresh, gray and black and use a screen to make sure nothing crawls in. Who knows if it is the right way or not. There are sure a lot of different ideas after reading this.

Just winterized 2 days ago