- 1). Cut several lengths of rebar with a hacksaw. The rebar should be four inches longer than the depth of the plastic bucket. Clean the majority of the rust from the sections of the rebar with the metal grinder. Grind one end of each piece to expose the bare metal. Place a ½ cup of laundry soda in the bucket and add five gallons of water. Mix the laundry soda and water thoroughly.
- 2). Place the sections of rebar in the bucket, with the clean ends up. Clamp the pieces of rebar firmly to the side of the bucket with an iron C-clamp. Ensure that the rebar pieces are evenly spaced around the inner edge of the bucket and won't move easily. Connect an electrical cable to the exposed metal at the upper end of each piece of rebar.
- 3). Tie one end of the iron chain above the bucket and ensure that it doesn't touch the cable or any of the rebar pieces. Tie the other end of the iron chain to the metal part that has rust. Submerge the metal part under the solution in the bucket and ensure it doesn't touch the rebar or the bucket.
- 4). Connect the battery charger's negative lead to the rusty metal part. Clip the battery charger's positive lead to one of the bare ends of rebar.
- 5). Turn the battery charger on. You should see bubbles forming in the solution and the orange color of the rust should gradually turn black as the rust is reduced back to iron.
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