If the water supply is from a well, iron bacteria produce this slime.
Add a little bleach to the tank water and scrub the tank inside with
a sponge soaked in bleach.
You can use chlorine bowl cleaning tablets in the tank, but you
may experience rapid deterioration of the rubber flapper unless
you put in the newer (red) chemical-resistant ones.
I replace a toilet last week because the toilet was stained beyond
repair. I tried bleaching it and I even used some product that claimed
to be able to help but did not. What a surprise! As luck will have
it, home depot had a sale on a toilet for $59. Prices vary widely,
however not being a toilet connoisseur; I really could not appreciate
the differences between the $59 toilet and the $900 counterpart.
Nevertheless, the new toilet leaves a better impression than the
permanently shit stained toilet I had before. It took me a Sunday
afternoon to install the new unit.
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