How to we get rid of this stain?

Daw15103634
by Daw15103634

Over the last several months one of our toilets has had this stain. I have used everything under the sun including a can of coke, lime cleaner, bleach tabs that go into the back of the tank etc. Can anyone tell me what it might be and how to get rid of it.

Toilet bowl mystery.

  12 answers