Fix the valve(silicone spray) might have to replace it. If you can see into the tank, you can use a wand to flush it out with an open valve. If not then will have to do the following . Put in Happy Camper it is powder and works very, fill the tank totally full and if you can pull the trailer around some to mix the mess up. Then let it sit for a few days. Then dump and might have to it again.
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Mike & Emily-Sacramento, CA
Our 4th trailer (2016 Aspen Trail 1900RB)
2018 F150 STX 2.7 Eco Boost
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