Welcome to the forum its a great place to get your questions answered. usually with two tanks one is the shower and bath sink the other is for the kitchen. I would recommend Installing a clear 45* elbow on the sewer outlet then using the strongest black tank cleaner you can buy letting it sit with a full tank of water for at least 48 hours then dump and and use your black tank flush system to hopefully break up and flush out what is left. JMHO
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Retired Navy
Jake my sidekick (yellow Lab) 10/04 - 05/20
2017 RAM 2500 CC 4X4 Cummins Diesel
2016 Flagstaff 26 FKWS
AF&AM & El Korah Shrine of Idaho
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