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How to remove rust from metal
Use white vinegar.
The vinegar reacts with the rust to dissolve it off of the metal. To use, soak the metal in white vinegar for a few hours and then scrub the rusty paste off.
If the object is too big to soak directly in the white vinegar, pour a layer over the top and allow it time to set. You can also wipe it down with a rag soaked in vinegar.