Thanks so much for the replies. Did I mention that I love this site???
I know. Isn't awesome!?!
Anyway, the Flush King does work fairly well, but you'll have to back-wash the tank more than once to get it clean. Never really bothered me until I got the wand and the DW saw what was being left behind. Both are better.
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Exactly my experience, too. The Flush King gets used more frequently than the wand, but both work well in combination. Unless you can see what is coming out, you really don't know for sure if the tank is clean.
In addition, we always add a capful of liquid Calgon water softener and a couple gallons of water to both the black and gray tanks every time we are done camping, dumping, and rinsing. The Calgon keeps the inside of the tank walls slick, so "stuff" doesn't tend to stick. We're on our fourth season with our Outback, and I've never had a problem with leaky dump valves or false sensor readings. (Knock on wood!)
Mike