If all else fails you might try to look for a Kleentank vendor in your area - to have it professionally done.
Clogs are often cause by leaving the black tank valve open. This builds the dreaded poop pyramid as the liquid drains out. To prevent this, after dumping the tank put 5 gallons or so water in. Keep the valve closed and dump it once every week and repeat.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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