I have used this method for year with no negative results. I will always add water, water softener and a bit of liquid dishwashing soap after dumping so the mixture can slosh around on the way home. I will dump at home. I also use the mixture going out to camp. So the tanks seem to remain very clean and I have had no problems with gauges. I think the sloshing around of the cleaning mixture is the key to keeping everything clean.
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