One thing I do, which I probably read from somewhere (or maybe I'm doing it wrong), is after emptying (and flushing) the blank tank, I put back in fresh water (about a third of a tank), and add the chemicals. This way the chemicals and water splash around during travel and help clean the tank, then next trip this tank is already primed and ready to go for use. I suppose this method doesn't really work if the chemicals only work for so long...
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