Bidet/toilet ring
I too inherited an older toilet with a "black ring" which could be as a result of not being flushed when house not used for months by previous owners (minerals in the water?).
I've just read a possible solution which I will try before replacing the toilet. Reduce water level, soak a paper towel in vinegar and wrap around ring, leave overnight - may need to repeat if not completely gone. Good luck to both of us!
No experience/opinion with bidets.
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