I’d tried everything, even a magic eraser. My toilet was CLEAN, but it was just irreversibly stained by the iron in the water.
And then I found barkeeper’s friend.
(sorry for the odd angle, I forgot I had taken the first one from a different perspective and I’m too lazy to go take another picture.)
It even got rid of some of the black gunk on the bottom there (that was from when we had to redo our water softener recently). Not completely, but it’s a lot better.
But seriously. YOU SEE HOW DARK THOSE RUST STAINS ARE. AND THEY ARE GONE. GONE! Why did I not know about this product until UFYH?