Test it on an unbotrusive area first, incase it has some nasty
effect on the finish or colour.
I have a tube of Jenolite Jelly which is Phosphoric Acid in a
jelly. I bought it from a car parts shop about 30 years ago as
a rust remover. I have used it on lots of things for removing
rust stains, including cloths. No idea if you could still find
it, but there's probably some equivalent Phosphoric Acid
product available. Again, test on an unobtrusive area first.
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