Get a container—most tools will be able to stand in a wide-mouth jar—and fill it with apple cider vinegar. Put the rusty tool in, and let it soak overnight. The next day, wipe the tool completely dry with a clean rag (and brush it with an old toothbrush if you need to). Apply some light machine oil to any moving parts, if necessary. Your tool should be rust-free and usable again.
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