"notbob" wrote in message
...
We have perfectly fine old toilet, which works fine and has no
mechanical problems. I care for my mom, who suffers from dementia,
and when she uses the toilet during the night, more often than not, she
forgets to flush. This leaves her urine to sit and deposit/stain
until I wake next morning to make sure the commode is flushed. Over
time, this has caused heavy brown deposits (lime?) in the bottom of
our porcelain crapper. I've tried to keep up, but they jes keep
adding up and now even scrubbing with the new fangled hi-tech brushes
with disposable pads can't remove the most heavy stains. I tried some
Lime-Away, which cleaned up the lighter deposits, but the heavy darker
one's in the very bottom remain. Any suggestions on what might remove
these stains? Would muriatic acid be too much? Obviously, I don't
wanna destroy the smooth porcelain glaze.

nb

Had this problem with my grown son who didn't bother to flush nor clean.
Nothing would remove it, so after draining as much water as possible, I
poured in about a cup or so of acid pipe cleaner from Home Depot that I had
sitting around. When it was poured in it foamed up, got hot, and then I ran
an all-plastic scrub brush around in the bowl. The liquid turned dark brown
and when I flushed it down it left a clean, stain free toilet.