"Norminn" wrote in message
m...

The light grey seal may be permanently STAINED, so even killing the mold
with bleach may not remove the stain. Use the bleach to kill mold
and then keep the door ajar slightly so that it dries between uses.

The seal will be permanently stained. Every time I have come across this
problem, the cause of the mould has usually been washing regularly at cool
temperatures.