Dish soap like Dawn and very hot water (not boiling) often does the trick. Also works well with clogged regular toilets. On them, let level slowly go down with soap in water. Then add more hot water as fast as it will go down dosed with more Dawn. Maybe a 1/4 cup per bucket full of hot water until running normally.
I have a hose end sprayer for RV toilets that might work but this one looks perfect for your needs. On Amazon for $26
Camco RV Flexible Swivel Stik with Shutoff Valve
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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