As someone said, Fill with 1/2 cup Dawn, (Regular NOT anti-bacterial) 1/2 cup Calgon water softener (Powder or liquid) and .. Well I go 1/6th water but I drive farther, say 1/3 water. Drive a while, making turns and such to slosh it around good.. DUMP, tank will read FULL (which it is.. Full of bubbles) give it a couple days for the bubbles to pop and dump again.. Then add around a quart of "pink stuff" down the toilet, then some more in the toilet (Water pump off no city water hook up, bleed pressure off water system before you do the last dump, in fact winterize fresh water system before last dump)
Pour pink into the drains for the traps, and walk away. This should take care of it.
NOTE: same for the gray tank.
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