As suggested on here by another member, after dumping at a site I fill black tank to about a third full add my chemicals then a bag of ice down the toilet just prior to leaving. The ice sloshing around does an excellent job of removing any residue. We use regular Charmin tp and never an issue.
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Indian Springs Farm
2018 3121RL Samsung Residential Fridge
2018 Ford F250 PSD Air Lift 5000
Sailun 637 tires Predator 3500 (2) paralleled
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