I will add that I've tried leaving my bathroom gray tank open one time for an extended period and dumped the galley and black tank as you describe. When it came time to go the ribbed sewer hose had enough "gunk" buildup from I suppose soap residue etc. that I just threw it away vs trying to spend the time trying to clean it out. Since yours is hard piped in and won't have ribs that may not be an issue. I would however try to run enough water through it when letting the bathroom gray drain that it would push any buildup on through the pipe.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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