I have two very old toliets, probably 40 years old.
Everyday turn black with I assume waste. First a ring forms then spotting. This is everyday and only my wife and I live here.
As toliets get older do they lose the coating and allow stuff to stick easier?
Drain it, clean it, wax it.
Seriously, a marine grade wax should last a while and seal out the dirty rings. That's what boat wax is supposed to do on a boat's hull. I'd try it. It's a far cheaper fix than replacing the toilets.
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Just be careful not to slide off....
Nice try Square Eye.....wax.....
You could also try repainting...like they do the tubs.
Just do it outside.Let the neighbors talk....read the paper.....
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