How to Remove Rust from Cast Iron (And Restore It to Like-New)

Rust on cast iron looks alarming, but it's almost never a death sentence. With the right tools and a bit of elbow grease, you can restore even a heavily rusted pan to full cooking condition.

What You'll Need

• Bar Keepers Friend Powder Cleanser — cuts through rust without harsh chemicals
• Knapp Made Chain Mail Scrubber — aggressive enough for rust, gentle on iron
• Lodge Pan Scraper — for edges and corners
• Field Company Seasoning Oil — to re-protect after rust removal
• Paper towels and warm water

How to Remove Rust from Cast Iron: Step-by-Step

Step 1: Assess the Rust Level

• Light surface rust (orange spots): scrub with chain mail + warm water
• Moderate rust (rough texture, flaking): use Bar Keepers Friend
• Heavy rust (deep pitting, flaking all over): electrolysis method or professional restoration

Step 2: Scrub with Bar Keepers Friend

Sprinkle Bar Keepers Friend powder onto the wet pan. Use the chain mail scrubber to work it into the rusted areas in circular motions. The oxalic acid in BKF dissolves rust without damaging the iron underneath.

Step 3: Use the Scraper for Edges and Corners

The Lodge scraper reaches into the curved edges where rust often hides and is difficult to reach with a scrubber.

Step 4: Rinse Thoroughly

Rinse all the BKF residue off completely. Don't let it sit — it's acidic and can damage the surface if left on too long.

Step 5: Dry Immediately and Completely

Dry with paper towels, then heat on the stove for 2 minutes to drive out all remaining moisture.

Step 6: Re-Season the Pan

Apply Field Company seasoning oil and bake at 450°F for 1 hour. Repeat 2–3 times to rebuild the protective layer.

How to Prevent Rust from Coming Back

• Always dry completely after washing
• Never soak or leave wet
• Apply a thin oil coat after every wash
• Store in a dry place (not under the sink)

Frequently Asked Questions

Is rusty cast iron safe to cook on?

Surface rust is not toxic, but you should remove it and re-season before cooking. Don't cook on heavily rusted pans.

Can I use steel wool to remove rust from cast iron?

Steel wool works but is very aggressive and will strip all seasoning. Use a chain mail scrubber instead — it removes rust while being gentler on the surface.

My cast iron keeps rusting even after seasoning. Why?

The seasoning layer isn't thick enough, or the pan isn't being dried completely. Do 3 rounds of oven seasoning and always heat-dry after washing.