In addition....
To all the other advice mentioned here. At least once a year I will purchase 2 bags of cubed ice, pour those into the black tank after dumping and getting ready to move from on place to another, the ice scrubs the tank, and melts away, then I dump when I get to my next location. So, the steps I take are, dump, flush add water and ice to black tank drive a couple of hours dump and flush.
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