In article ,
"ctl" writes:

"daveL" wrote in message
...
My plumber drained my central heating system into my loo today and now I
have a dark stain over the white ceramic.

How am I best to remove this stain?

Use a few bottles of coke or throw in a packet of denture cleaning tablets!
Both work very well.

It's probably just stained a thin limescale coating, in which case
any of the toilet limescale removers will remove it.

--
Andrew Gabriel