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My previous rig bought used had the poopile issue as the owner stayed a season at an RV resort and I'm guessing left the black valve open. Only one year and the tank indicators were stuck on full. Used a geo methode (mix of Calgon and Dawn soap) for one season (we snow bird the same as you) and lots of water and the tank flushed clean and the level indicators worked again. Now with new rig we only use geo mix and have no issues. BTW, tp makes no difference as long as you use septic approved tp. I speak from 30 years experience in waste managment business and septic system installation.
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