When I moved in about 2 years ago, the bowl below the water line was
badly stained a brown colour. Thinking it was the obvious, I
eventually took the plunge to see if it would be easy to remove. It
simply wiped off and I had a perfectly white bowl.
However, the bowl is again starting to stain. It is flushed after
every use and the water is clear, there is no staining in the cistern.
Using a toilet brush would prevent anything building up over time, but
what would be causing it?


David