How to Remove Rust from Cast Iron — Step-by-Step Guide
A rusty cast iron skillet is not ruined — it just needs some TLC. Rust on cast iron is a surface issue that can be completely reversed with a little scrubbing and re-seasoning. This guide walks you through exactly how to restore rusty cast iron to like-new cooking condition.
How to Remove Cast Iron Rust
Scrub the rusty areas with a steel wool pad or chain mail scrubber under warm running water. For heavy rust, soak in a 50/50 solution of white vinegar and water for no more than 30–60 minutes (longer can pit the iron). Rinse thoroughly, scrub again, and immediately dry completely on the stovetop over low heat. Never air-dry cast iron.
How to Re-Season Cast Iron After Rust Removal
While the pan is still warm, rub a very thin layer of flaxseed oil, vegetable oil, or shortening all over the pan — inside and out, including the handle. Wipe away any excess with a clean cloth (no oil pooling). Place upside down in a 500°F oven for 1 hour. Let cool in the oven. Repeat seasoning 2–3 times for best results.
Frequently Asked Questions
What causes cast iron to rust?
Cast iron rusts when exposed to moisture for extended periods. Always dry cast iron completely immediately after washing and store in a dry place.
Can you cook with a rusty cast iron skillet?
A small amount of surface rust won't make you sick, but you should remove it and re-season before regular use for best cooking performance.
How do you prevent cast iron from rusting?
Dry immediately after washing, apply a very thin layer of oil, and store in a dry cabinet or oven. Never soak cast iron or leave it wet.