How to Clean a Cast Iron Skillet (Without Ruining It)

To clean a cast iron skillet, wash it with warm water and a little dish soap, scrub with a stiff brush or pan scraper, dry it completely right away, and rub a very thin layer of oil over the surface. That wash, dry, oil routine is the one Lodge, a major US cast iron maker, recommends. Do not soak the pan, and do not put it in the dishwasher.

With Thanksgiving cooking about to start, plenty of people are digging an old skillet out of the cupboard and wondering whether soap is allowed, how to handle burnt-on food, and what to do about rust. This guide answers each of those, problem by problem, using Lodge's care instructions and the food-science explanation of how seasoning actually works.

First, What Is "Seasoning"?

Seasoning is a thin, hardened layer of baked-on oil that protects cast iron from rust and helps food release. As Wikipedia's overview of cookware seasoning puts it, it is the process of coating cookware with fat, then heating it to produce a corrosion-resistant layer of polymerized fat. When oil is heated, the fatty acids polymerize and harden into that layer. It is needed for raw cast iron and carbon steel, which otherwise rust quickly in use.

That is the whole reason cleaning cast iron feels fussy. You want to remove food, not the coating. A well-seasoned surface is also self-repairing: every time you cook with fat and clean gently, the layer builds up a little more.

The Three-Step Daily Clean: Wash, Dry, Oil

Lodge describes classic cast iron cleaning in three steps:

1. Wash. Use warm, soapy water and scrub with a stiff-bristled brush or scrubbing pad.
2. Dry. Dry it completely with a paper towel or lint-free cloth. Do not leave it to air dry.
3. Oil. Add a thin layer of oil and use a paper towel to spread it over the whole surface.

Doing this right after cooking, while the pan is still warm but safe to handle, is easiest. Lodge says rust can appear if cast iron is left to soak in the sink, put in the dishwasher, allowed to air dry or kept in a damp place.

Can You Use Soap on Cast Iron?

Yes. Lodge says soap is "totally okay" on cast iron. The company explains that the dish soap we use today is no longer strong enough to strip seasoning and is a good way to prevent build-up. Wikipedia's seasoning article agrees that the protective layer itself is not very susceptible to soap and that many users briefly use detergent, while noting that some cookbook authors prefer just wiping, a salt scrub or boiling water.

Lodge's point is that today's dish soap is far gentler on seasoning than the old "never use soap" rule assumes. The real enemies are long soaks and dishwashers, not a quick sudsy wash.

What to Do for Each Kind of Mess

Problem	What to do
Light residue after cooking	Wipe out, or wash in warm soapy water with a brush, dry fully, and add a thin coat of oil (Lodge's three steps).
Stuck-on food	Use a nylon scrubbing brush or a pan scraper and rinse under warm water. Lodge says not to soak the pan.
Greasy or stubborn residue	Wipe with a salt scrub, or boil a little water in the pan to loosen it. These are methods some cookbook authors recommend, per Wikipedia.
Small patches of rust	Scour the rust off with a Lodge Rust Eraser or steel wool, wash, dry fully, and apply a very thin, even layer of oil inside and out.
Heavy rust	After scouring and drying, reseason: Lodge says to heat the oven to 450 to 500 degrees F, place the pan upside down on the top rack and bake for one hour, then let it cool in the oven.
Brand-new, never-used pan	Wikipedia notes that new cast iron often comes with a protective coating of wax or shellac; an initial scouring with hot soapy water usually removes it.

Stuck-on food

The temptation is to fill the pan with water and walk away. Don't. Lodge states plainly that soaking is a recipe for rust. Instead, scrape off the worst with a pan scraper or nylon brush, then rinse under warm water. Wikipedia adds that cast iron can have tiny pinholes in the seasoning, so long soaks can cause the layer to flake off.

Metal scrubbers and steel wool

Lodge does not recommend steel wool or a metal scrubber for daily cleanup, but says it is perfectly fine for removing rust. Afterwards, wash, dry and oil, because you may have removed seasoning along with the rust.

Rust: not a disaster

Lodge's message on rust is reassuring: it happens to the best of us and is fixable at home. For small amounts, scouring plus a thin coat of oil may be enough. For larger amounts, you need the oven reseasoning step above. Our explainer on the Statue of Liberty's green patina shows the same chemistry in a different metal: oxidation is a surface reaction, and a protective layer can stop it.

Can You Put Cast Iron in the Dishwasher?

No. Lodge says cast iron should be washed by hand because a dishwasher will remove the seasoning and likely cause rust. The same goes for the self-clean cycle: Wikipedia notes that old seasoning can be burned off at very high temperatures, which is exactly what you do not want during routine care.

Does the Oil You Use Matter?

Less than the internet suggests. Wikipedia notes that the precise seasoning details differ from one source to another, there is "much disagreement" about the best oil, and there is no clear consensus about the best temperature and duration. Lodge itself says all oils and fats can be used, though it uses a soybean-based blend in its factory seasoning. What Lodge and Wikipedia's overview both stress is the same: apply a thin layer of oil, not a thick one.

Can You Cook Tomatoes and Other Acidic Food in Cast Iron?

Some food writers advise against it because acid can eventually erode the seasoning. Wikipedia cites tests by America's Test Kitchen finding that simmering a highly acidic tomato sauce for more than 30 minutes produced a metallic taste, while cooking acidic food in a well-seasoned pan for a short time is unlikely to have negative consequences. Cast iron suits foods with plenty of oil or fat, such as chicken, bacon or sausage, and deep frying.

What About Other Cookware: Enameled and Carbon Steel?

• Carbon steel: Lodge says caring for carbon steel is just like caring for cast iron.
• Enameled cast iron: Lodge says to hand wash it in warm, soapy water. It does not need seasoning because the enamel is the coating.

A Simple Routine for Thanksgiving Week

• Cook, then wash while the pan is still warm.
• Scrape stuck bits, never soak.
• Make sure the pan is completely dry before you oil it.
• Store it somewhere dry. Moisture is the main enemy.

Planning the holiday meal? Check when Thanksgiving 2026 falls and the surprising story of how Thanksgiving got its date.

Frequently Asked Questions

Is it OK to use Dawn dish soap on cast iron?

Yes. Lodge says ordinary dish soap is fine because modern soap is not strong enough to remove seasoning. Wash quickly, rinse, dry and oil, and do not leave the pan soaking.

What ruins a cast iron skillet?

Soaking, the dishwasher, air drying and storing it in a damp place are the usual culprits, because they cause rust. Lodge says these conditions can cause rust, and that a dishwasher will remove the seasoning.

Can you just wipe out a cast iron skillet?

Yes. Many cookbook authors recommend just wiping seasoned cookware clean after each use, according to Wikipedia. A wash with warm soapy water is also fine, as Lodge says.

How do I get black buildup off a cast iron skillet?

Scrub with a stiff-bristled brush, nylon brush or pan scraper in warm soapy water. For heavy buildup or flaking, a full reseasoning in the oven (450 to 500 degrees F for one hour, per Lodge) gives you a fresh layer. Stripping old seasoning completely is a bigger job, done with oven cleaner, lye baths or high heat, according to Wikipedia.

How often should I season my cast iron?

Lodge's daily routine includes a thin coat of oil after each wash, which maintains the seasoning. Lodge's guidance calls for a full oven reseasoning when there is a larger amount of rust.

Is a little rust dangerous?

Lodge says rust is common and easy to fix at home by scouring, washing, drying, oiling and, for larger patches, reseasoning in the oven.

The Bottom Line

Cast iron is tougher than its reputation. Wash it with a little soap, scrub gently, dry it fully and add a whisper of oil. Skip the soak and the dishwasher, and if rust shows up, scour, dry, oil and reseason. Do that and your skillet can last for generations.

Sources

• Lodge Cast Iron: How to Clean
• Lodge Cast Iron: Cleaning and Care
• Wikipedia: Seasoning (cookware), with its cited sources including America's Test Kitchen