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I've used the Birchwood-Casey Rust and Bluing Remover (a fluid) and found it did the job well. (It's the only Birchwood-Casey product I can recommend.) You've find it at gunshops and places that sell cold bluing, cleaning supplies for guns, etc. I saw some in a gun shop, recently.
The last time I bought a bottle, it was like $5, but that was sevearl years ago. It doesn't take much.
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