How to Clean a Cast Iron Skillet

Clean cast iron without losing its seasoning by using warm water, a brush or scraper, and only a small amount of mild soap if you need it. Dry the pan immediately, then wipe on an almost invisible layer of cooking oil. Use simmering water for stuck food and scrub off rust before re-seasoning; never soak the skillet or put it in the dishwasher.

Before you start

Let the skillet cool to a temperature you can handle safely; cleaning a red-hot pan with cold water can cause splashing and thermal shock. You need little more than warm water, a stiff brush, a wooden or plastic scraper, a towel, and a neutral oil that tolerates high heat. Mild dish soap is optional. If the seasoning is visibly sticky, flaking, or thin, avoid extra abrasion and plan to re-season the bare areas.

Everyday cleaning method

1. Let it cool enough to work on. Clean the skillet while it is still warm, because residue comes off more easily, but not while it is dangerously hot.
2. Remove loose food. Tip out the crumbs and scrape off stuck bits with a wooden spatula, plastic pan scraper, or the edge of a metal spoon.
3. Wash with hot water and a brush. Add enough warm or hot water to cover the base, then scrub with a stiff brush. Rinse away everything the brush has loosened.
4. Use mild soap only when needed. A small drop of ordinary mild dish soap can remove grease without ruining well-cured modern seasoning. Scrub gently, rinse, and avoid harsh detergent, concentrated cleaner, or boiling soapy water.
5. Dry it at once. Wipe with a clean towel, then set the skillet over low heat for a minute or two until every drop has evaporated. The pan must be completely dry before oiling or storage.
6. Add a very thin coat of oil. With the pan still warm, put one drop of neutral, high-heat oil on a paper towel and wipe the cooking surface. Keep wiping until the pan looks dry; leftover oil collects, turns sticky, and eventually flakes off.
7. Store it correctly. Put the skillet on a dry burner or in a dry cupboard, preferably with the lid ajar or a paper towel between nested pans so moisture cannot remain trapped.

Removing stuck-on food

Do not fill the skillet with cleaner and leave it overnight. Heat can loosen most stuck food without soaking the metal or removing the seasoning.

1. Add a shallow layer of water. Put the skillet over medium heat and bring the water to a gentle simmer. A few minutes is usually enough to soften residue; add more water if the pan begins to dry.
2. Scrape as it softens. Use a wooden spatula or plastic scraper to lift the food away from the surface. Avoid forcing a metal utensil between the food and the pan, since it can scratch the seasoning.
3. Repeat, then brush. Pour off the dirty water, add fresh water if needed, and scrub the remaining spots with a stiff brush. Most residue should come off once it has softened.
4. Use coarse salt for stubborn spots. Make a paste from coarse salt and a few drops of oil, then scrub it over the residue with a paper towel or cloth. Rinse, dry, and oil the skillet as usual.
5. Check the seasoning. If the food took part of the seasoning with it, the bare patch may look gray or silver. Coat the entire skillet very lightly with oil; a full oven re-season is needed only when large areas are bare.

Removing rust and re-seasoning

Rust is not seasoning. It forms when iron or exposed metal stays wet, and it must be removed before the skillet is seasoned again. Light surface rust is usually repairable, while deep pitting or a cracked pan may not be.

1. Remove loose rust. Wash and dry the skillet, then rub the rusty areas with a coarse cloth, stiff brush, or chain-mail scrubber. Work over a sink or tray because the rust will flake off.
2. Scrub back to clean metal. For surface rust, use fine steel wool or a chain-mail scrubber with a drop of oil. Scrub only until the rust disappears and clean gray metal appears, because excessive abrasion also removes good seasoning.
3. Rinse and dry completely. Wash away every rust particle with hot water, towel-dry, and warm the skillet on the stove until it is bone dry. Do not leave it wet overnight.
4. Apply a thin layer of oil. Coat the entire cooking surface with a high-smoke-point oil, then wipe it with a paper towel until it looks almost dry. A visible film of oil is too much.
5. Heat the oil. Place the skillet upside down in an oven at about 450°F (230°C), or follow the seasoning oil’s directions because recommended temperatures and times vary. Bake until the surface looks dry and glossy, then turn off the oven and let the pan cool inside.
6. Check for deep damage. If the metal remains deeply pitted or the seasoning stays blotchy, repeat the cleaning and seasoning cycle. Deep pits cannot be repaired by oil, and a badly damaged skillet is safer and more reliable to replace.

Tips and common mistakes

• Never soak cast iron. Even a short soak can let water reach bare metal and start rust. Use simmering water for stuck food instead.
• Never put cast iron in the dishwasher. Prolonged moisture, harsh detergent, and trapped water can strip seasoning and cause rust.
• Do not scrub routinely with steel wool. Reserve abrasive scrubbers for rust or food that will not come off with a stiff brush.
• Do not store the skillet damp. Dry it fully, oil it lightly, and keep it away from wet sinks, damp basements, and closed cupboards where moisture can linger.
• Use oil sparingly. A thin coating protects the iron; a heavy layer becomes sticky, catches food, and flakes into the pan.
• Avoid sudden temperature changes. Do not pour cold water into a very hot skillet. Let it cool briefly first and use warm or hot water.
• Do not confuse discoloration with rust. An uneven brown or black surface can be harmless seasoning. Rust usually appears as orange-brown patches, rough flakes, or reddish staining.
• Do not use strong alkaline or acidic cleaners for routine washing. They can remove seasoning and leave the metal vulnerable to corrosion.

Key takeaways

• Use warm water, a brush or scraper, and mild soap only when necessary.
• Dry the skillet immediately and thoroughly before adding oil or putting it away.
• Loosen stuck food with simmering water rather than soaking the pan.
• Remove rust down to clean metal, then apply a thin coat of oil and heat it.
• Keep the oil coating extremely thin and never leave cast iron wet for long periods.

Frequently asked questions

Can I use dish soap on cast iron?

Yes. A small amount of mild dish soap is generally safe for modern, well-cured seasoning and can make greasy pans easier to clean. Rinse the soap away, dry the skillet completely, and apply a thin coat of oil. Harsh detergent, concentrated cleaner, or a prolonged soapy soak is much more likely to strip seasoning.

Do I need to re-season the skillet after every cleaning?

No. After most uses, a very thin coat of cooking oil is enough. Re-season the whole pan when large areas look bare or gray, when the surface remains blotchy after cleaning, or when rust has been removed. If the seasoning is merely dark and smooth, it does not need to be stripped and rebuilt.

Why is my cast iron skillet rusting?

Rust usually means that bare iron was exposed to moisture, often because the pan was washed and left wet, stored in a damp place, or coated with too much oil that later turned sticky. Dry the pan, remove any rust, and season it again. After use, wipe it dry, warm it briefly, and apply only a thin layer of oil before storing it.

Can I put cast iron in the dishwasher?

No. Dishwashers combine strong detergent, heat, and prolonged moisture, all of which can remove seasoning and encourage rust. Wash cast iron by hand with warm water and a brush, dry it immediately on the stovetop, and oil it lightly before putting it away.