Here’s how to remove rust with electrolysis. You’ll need a plastic or glass container deep enough to hold enough water to cover your rusty item. And you’ll also need a battery charger, a box of washing soda (found with the laundry detergents at just about any big grocery store), a short copper wire and some rebar bent to fit around the object you’re restoring.
Hook everything up as shown and walk away. It gets rid of most of the rust. You’ll still need to polish with sandpaper, steel wool or Scotch pads to get down to bare metal.
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Source: Family Handyman