Small Cast-Iron Objects
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Pour 2 L. of Coke into a bucket, tub or sink.
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Let the cast-iron object soak in the Coke for 24 hours.
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Rinse the Coke off the cast iron with clean water. Dry the object with a clean cloth.
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Apply a light coat of wax or vegetable oil with a clean, dry cloth to protect the cast iron from future rust.
Large Cast-Iron Objects
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Set your cast-iron object on top of a tarp. It is best to clean your large cast-iron object in a garage or outside, as the cleaning process can get messy.
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Pour Coke over the rusty spots of the cast-iron object. Let the Coke sit on the rust for 15 minutes.
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Saturate a sponge with Coke and scrub the rusty spots.
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If the rust remains, pour more Coke on the cast iron. Wait 15 minutes and scrub again. Repeat this process as often as needed until all of the rust is removed.
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Rinse the cast iron with clean water. Dry the object with a clean cloth.
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Coat the cast iron with wax or oil to prevent future rust.