My 2009 Rockwood has a built it tank washer. I think it's a Tornado, but from the sound of it, it would have "arms" like inside a dishwasher.
And like every one else I close the drain gate and let it run for a minute or two. I never get distracted, partly because RV dumps just aren't all that interesting, and the guy behind me wants to use the dump, too.
Plus I use a scoop of laundry soap and water softener in there as well as the TST treatment, like everybody else.
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The same guy has a test of black tank treatments, too. I see if I can find that.
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