August 22, 2026, 7:39 am | Read time: 4 minutes

The cast iron pan is a versatile tool in the kitchen. It sears meat and vegetables, handles oven dishes, and, with proper care, often lasts a lifetime. What makes it special and different from other pans is its so-called patina. This is the protective layer on the surface created by burnt-in fat and heat. With the right care, the patina develops increasingly better non-stick properties. When cleaning, it’s crucial to maintain this protective layer.

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Always Clean a Cast Iron Pan by Hand

Alexander Heinrich from the Consumer Advice Center Saxony-Anhalt advises against putting a cast iron pan in the dishwasher. “The patina will be damaged or removed, and the pan will start to rust, making it easier for heavy metals to transfer to food,” says the expert on food safety, food quality, and misleading practices. To avoid rust, the pan should be washed by hand promptly after use. The best way to do this is with warm water and a soft sponge or cloth that won’t scratch the patina. Heinrich also recommends cleaning the protective layer as gently as possible, as vigorous scrubbing can remove the patina.

However, there could be an exception. “Forged and cast iron pans should only be cleaned in the dishwasher before first use if the manufacturer recommends it to remove the factory rust protection,” adds Kerstin Effers, a chemist and expert on environmental and health protection from the Consumer Advice Center North Rhine-Westphalia.

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Use Little Detergent and Dry Thoroughly

While stainless steel pans can be cleaned with detergent without issue, it’s best to avoid it with cast iron pans. Aggressive ingredients can attack the patina. If water alone isn’t enough, Alexander Heinrich suggests using mild detergent and avoiding long soaking times. Ideally, light residues should be removed during frying with a metal spatula.

If burnt food residues remain in the pan, they can also be rubbed off dry with salt, reveals expert Kerstin Effers. Thoroughly drying the cast iron pan is particularly important. “The iron pan should always be well dried and stored dry to prevent rust spots,” says Effers.

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What to Do About Rust Spots?

After washing and drying, it’s advisable to rub the patina with a small amount of cooking oil. This primarily serves as rust protection and helps maintain the patina, explains Alexander Heinrich. If rust spots form despite careful maintenance, there’s no need to worry. Light rust spots can be removed with fine steel wool, says Effers. A damaged or removed patina can always be restored. “For this, the pan is first freed from rust and old residues and then re-seasoned,” says Alexander Heinrich.

Proper Storage of a Cast Iron Pan

To protect a cast iron pan from rust, proper storage is also important. Ideally, the pan should be hung on a kitchen rail. This allows any remaining moisture to evaporate and the pan to be well-ventilated. Hanging also protects the patina from friction.

If you don’t have such a kitchen rail, the cast iron pan can, of course, be stored in a kitchen cabinet. To further protect the patina, a suitable underlay is recommended, especially if other pans or pots are stacked on top.

For a long lifespan of the pan, experts also recommend avoiding the preparation of acidic foods like tomato sauces. Under the influence of acid, iron can dissolve, allowing heavy metals to transfer to food, explains Alexander Heinrich. Additionally, frequent use of cast iron pans can cause flavors and aromas to become embedded in the patina and later transfer to other foods, Heinrich adds. The expert advises owners to use separate pans for preparing meat, fish, and vegetables.