tim... wrote:
My toilet pan has a stain below the watermark that neither bleach nor
readily available acid (vinegar) will remove

what stronger products are easily available that will remove it?





Any idea what the stain is you seem to have tried the obvious things that
would dissolve limescale or remove the colour at least if normal waste that
goes down a toilet. It is possible it is a stubborn limescale deposit and
more concentrated or longer exposure to acid may help. In our first grotty
rented place the bottom of the toilet was damaged the glaze was chipped or
worn and it looked greyish the owner replaced it eventually due to another
problem.