How do you clean a burnt cast iron pot?

Scrub the burnt layer off with hot water and a stiff brush or a chain mail scrubber, using as little soap as you can get away with, then dry the pot completely on the stove over low heat. While the iron is still warm, wipe a thin film of cooking oil across the cooking surface so the bare metal does not rust.

Cast iron is forgiving. The black seasoning layer is polymerized oil, and a burnt patch usually sits on top of it rather than inside the metal, so the job is to lift the burnt material without stripping the whole surface. Work in stages: soak, scrape, then reseason only the area that looks dull or gray. The guides below cover pots that are not cast iron, and their makers publish care instructions that show how differently other cookware is handled.

Loosen the burnt layer before you scrub

Fill the pot with hot water an inch or two above the burnt patch and set it back on the stove over low heat for a few minutes. The water softens the carbonized food without attacking the seasoning. A wooden spoon or a nylon scraper can then lift the softened crust. Do not boil the pot dry, and do not plunge a hot pot into cold water, because the thermal shock can crack cast iron.

For a stubborn patch, sprinkle coarse salt into the pot with a splash of water and scrub with a folded cloth or a stiff brush. Salt is abrasive enough to break up carbon and dissolves away in the rinse. Avoid steel wool on a seasoned surface: it cuts through the polymerized layer and leaves gray metal that will rust. If you do expose bare iron, plan to reseason that spot.

Soap, water and what the makers of other pots say

A small amount of mild dish soap is fine on modern cast iron, because the seasoning is bonded to the metal and a short wash will not remove it. What damages the surface is long soaking, which lifts the seasoning at the edges and lets rust start underneath. Rinse quickly, then move straight to drying. Never leave water standing in the pot overnight.

Other cookware has its own rules, and the makers are specific about them. Bialetti states that its Moka Express must only be rinsed with clean water after use, with no detergents, and that the pot is not to be washed in a dishwasher because it will be irremediably damaged. Easyworkz takes the opposite approach with its Diego stovetop espresso maker, which the maker describes as dishwasher safe. The Best Moka Pots for Stovetop and Electric Brewing guide lists both, and the contrast is a reminder to read the care line for each pot rather than applying one rule to everything.

Dry the iron fully, then reseason

Set the rinsed pot on a burner over low heat for five to ten minutes, until every trace of moisture has evaporated. Cast iron is porous and holds water in the surface, so air drying alone often leaves enough moisture for rust to bloom. Warm the pot, not a scorching hot one, and turn it off once it is dry to the touch.

Then apply a thin coat of a neutral high smoke point oil, such as vegetable or canola, across the cooking surface and the interior walls. Wipe it back so the surface looks damp rather than greasy, because pooled oil turns sticky when it sets. Put the pot upside down in a moderate oven for an hour, then let it cool inside. One round usually restores a burnt patch; a badly stripped pan may need two or three.

Stainless and nonstick pots need different handling

A burnt stainless pot can take a harder scrub than cast iron, and several makers point to the dishwasher. Cooler Concepts describes its 5.5 quart pasta pot and lid as dishwasher safe and advises drying promptly after washing to keep the polished finish bright. Oster lists its Sangerfield 5 quart pasta pot set as dishwasher safe but recommends hand washing, and the set weighs 3.6 lbs with an assembled size of 11 inches long by 8.5 inches wide by 10.5 inches high. The Best Pasta Pots for Draining Without a Colander guide compares these pots.

Nonstick surfaces are the least tolerant of a burnt patch. Gotham Steel coats its 5 quart stock pot with a triple coated ceramic surface reinforced with titanium and states that food releases with little to no oil or butter, which is the reason a burnt layer should be softened in warm soapy water rather than scraped with metal. Abrasive pads and metal utensils cut the coating, and once it is cut the pot cannot be repaired at home.

Stackable and steamer pots: check the coating first

Detachable handle sets stack for storage, and their interiors are usually coated, so the same gentle rule applies. GreenLife states that its pans have a nonstick surface that can be wiped with a paper towel or rinsed with water for a quick hand wash, and that the pans are oven safe up to 600°F while the glass lids are oven safe up to 350°F. Redchef states that its ceramic coated set is oven safe up to 842 degrees. Both appear in the Best Stackable Pots for Small Kitchens and RVs guide.

Steamer pots are often stainless and tolerate a firmer scrub. LOLYKITCH describes its 5 quart tri-ply steamer as having a smooth brushed interior designed for straightforward maintenance, and Kirecoo states that its 3.2 quart steamer is dishwasher safe in addition to being easy to clean by hand. The Best Steamer Pots for One Person or a Whole Family guide compares five of them. For any of these, confirm whether the surface is bare metal or coated before choosing a scrubber.

When a burnt pot needs more than a scrub

If the burnt layer covers the whole interior and the seasoning underneath has flaked away, the practical route is to strip the pot back to bare iron and start again. That means removing the old seasoning with an oven cleaner in a well ventilated space, then washing, drying and building up several thin oil layers. This is a bigger job than a spot repair and is worth doing only when the surface is genuinely failing.

Rust is a separate problem from burnt food. Orange patches mean moisture sat on bare iron, and they lift with a vinegar and water scrub followed by a full dry and a fresh oil coat. Pitting, where the metal looks cratered, cannot be fixed at home. A pot with deep pitting will keep catching food, and no amount of reseasoning will fill the holes.