I wouldn't be worried about the stain, providing it's being disinfected. Dishwasher on high temp is good, otherwise just dampen it, sprinkle it completely with salt, leave it half an hour then give it a scrub and rinse. Nothing's gonna survive the salt.
Ooohh! Thanks ladies I shall try the salt and lemon. If that doesn't work, I'll try the vinegar and bicarb. Unfortunately I'm the dishwasher in our house! I wish I had a mechanical one, lol!
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