Grey tank stopped up won't drain
we have always left our grey and black tank valves open as we are full timers [living at a campground 365/24-7] for past 4yrs. This problem of the grey tank getting stopped up only started last month...
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DAWN...full big bottle of DAWN dishwashing liquid + full tank of water + leave alone for a couple days. Then open the valve. Worked for me on a plugged black tank.
