How to Remove Burnt-On Grease from Cast Iron

Cast iron is a legacy tool that thrives on neglect but suffers from improper cleaning. When stubborn, carbonized grease turns your pan into a sticky, blackened mess, you aren't just dealing with food residue—you are dealing with a breakdown of your seasoning layer that needs a surgical touch, not a nuclear option. A successful cleaning restores the smooth, non-stick patina of the metal without resorting to harsh abrasives that expose raw iron to rust. Done well, this process clears the gunk while leaving the dark, polymerized oil base intact, saving you from having to strip and re-season the entire piece from scratch.

1. Soften the carbonized layer. Fill the pan with an inch of hot water and place it on the stovetop over low heat. Let the water simmer for five minutes to soften the hardened grease deposits.
2. Abrade with salt, not steel. Pour a half-cup of coarse kosher salt into the empty, warm pan. Use a folded paper towel or a stiff-bristled brush to scour the affected areas using the salt as a gentle abrasive.
3. Neutralize stubborn residue. If the grease persists, mix two tablespoons of baking soda with one tablespoon of water to create a thick paste. Spread it over the stubborn spots and let it sit for ten minutes.
4. Lift without gouging. Use a plastic pan scraper or the flat edge of a wooden spatula to lift the softened paste and grease. Do not use metal scrapers, which can gouge the seasoning.
5. Eliminate all moisture fast. Rinse the pan with hot water to remove all salt and baking soda residue. Immediately dry the pan completely with a lint-free cloth or paper towel.
6. Seal the seasoning layer. Apply a very light drop of vegetable oil to the surface and buff it in with a paper towel until the pan looks matte. This seals the iron after the deep cleaning.