Rust on sail

I picked up a used main sail, on the bottom panel are 7 small rust spots about the size of a dime to a quarter.
Anyone have a good remedy for removing these spots without destroying the cloth. It's not a major issue, but does distract from a really nice sail.
Thanks.

C L R ??

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_________________
Matt Miller
Former - Director of Parts and Accessory Sales
Warranty and Technical Support
Hobie Cat USA
(Retired 11/7/2022)

Basically, anything with oxalic acid as an active ingredient will work. Check the concentrations, though.

My favorite is:


It has other handy uses, too.