Boeshild Rust Free
Boeshield Rust Free attacks rust with a phosphoric-acid formula, so when applying it wear latex or rubber gloves to prevent skin burns. Spray Rust Free onto affected areas, allow it to penetrate for 30 to 60 seconds, and then scrub with a scouring pad or steel wool, middle photo. (If left on more than a couple of minutes, Rust Free will create dark stains that could become permanent on cast iron.) Repeat if necessary. This product removes the rust as well as dark stains, but it dulls the patina, bottom photo. If you're cleaning only part of the top, this dull look will be noticeable.
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