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I'm a fan of phosphoric acid. You can get it at a hardware store. Just look for Ospho or anything which contains phosphoric acid. You don't need to pay chandlery prices. It will remove rust from anything. Just wipe it on and wait a few minutes. If the stain is old/deep/big, you might need to do it a few times. No rubbing needed. I go over my boat's exterior and wait for the next rain. This time of year, that's only a few minutes!
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