Rescue a rusty cast-iron pan

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Four steps

1. Scrub off loose rust with a chainmail pad or brush.
2. Wash, rinse and dry completely.
3. Rub on a thin layer of oil; wipe until it looks dry.
4. Bake upside-down in the oven, cool, and repeat if needed.

Rust is surface-level in most cases; a pan with deep pitting or cracks may not be worth saving.

General guidance, not a tested method.