To clean a cast iron skillet, let it cool a bit after cooking, then wipe out food with a paper towel while it’s still warm. For stuck-on bits, scrub with coarse salt and a damp cloth or a plastic pan scraper — and yes, a little mild dish soap is fine on a well-seasoned pan (the old “never use soap” rule is outdated). Rinse, then dry the skillet immediately and completely — ideally on a warm burner — since standing water causes rust fast. Finish by rubbing on a thin coat of oil to maintain the seasoning. Never soak it or put it in the dishwasher. Here’s the full guide, including rust restoration.
June 3, 2026
How To Clean a Cast Iron Skillet Like a Pro
How to clean a cast iron skillet after use
Cleaning the skillet after every use keeps it in good shape. As soon as you finish cooking, let the pan cool until it’s warm but safe to handle, then wipe the cooking surface with a paper towel. Do this while it’s still warm, not hours later, so food doesn’t dry and stick.
If it’s still dirty or smells of the last meal, wash it briefly with a non-abrasive sponge and a little soapy water. On the soap question: a small amount of mild modern dish soap is perfectly fine on a seasoned cast iron pan — today’s soaps don’t strip the polymerized seasoning the way harsh lye-based soaps once did. What you should not do is soak the pan or leave it submerged.
Rinse thoroughly, then dry it immediately and completely — a paper towel or cloth first, then set it on a low burner for a minute or two to drive off every last bit of moisture. Never let water sit in a cast iron pan, even for a few hours, or it’ll rust quickly. Finish with a very thin coat of oil while it’s warm to protect the seasoning.
How to clean a cast iron skillet with burnt-on food
For a scorched pan, reach for kosher or coarse sea salt: sprinkle it inside the pan and scrub with a damp cloth or paper towel. The salt is a great gentle abrasive that lifts burnt-on food without harming the seasoning. A plastic pan scraper helps with stubborn spots. Avoid steel wool or metal scouring pads for routine cleaning — they strip the seasoning (steel wool comes out only for rust restoration, below).
How to clean black residue off a cast iron skillet
Over time you may see black residue build up. First, the reassuring part: black residue is harmless — it’s just carbonized food and oil, and poses no health risk if a little ends up in your food. (Seasoning itself is dark; you don’t want to remove all the darkness, only loose flaking residue.)
It usually builds up from incomplete cleaning or oil that wasn’t heated enough to bond. To remove loose black residue, use salt or a stiff (non-metal) brush:
Removing black residue with salt
Step 1: Add a few cups of water to the pan and bring to a boil for a few minutes, then turn off the heat — the heat loosens the stuck residue.
Step 2: Carefully dry the pan with a paper towel or cloth (it’ll be hot — use a mitt).
Step 3: Add about a half cup of coarse salt and scrub the surface with a folded cloth or paper towel. The residue should peel away.
Step 4: Wash with a little mild dish soap and warm water; repeat if residue remains.
Step 5: Rinse and dry completely (finish on a warm burner).
Step 6: Re-season: rub a thin coat of oil over the pan (vegetable, canola, grapeseed, or flaxseed oil all work), then heat it a few minutes until it stops smoking so the oil bonds. Thin is key — too much oil goes sticky.
Pro Tip: While you’re at it, clean your microwave too.
How to clean a rusty cast iron skillet
Don’t throw out a rusty skillet — it’s almost always restorable. (For the record, a little surface rust isn’t a serious health hazard, but you’ll want to remove it.) For badly rusted pans you can have a machine shop strip it back to raw iron, but for ordinary surface rust, do it yourself:
You’ll need
- Steel wool (this is the one time it’s appropriate)
- Cooking oil
- An oven
- Mild dish soap
- Protective gloves
- A stiff-bristled brush or scouring sponge
- Aluminum foil
Step 1: Scrub the rust off with steel wool until you’re back to clean, raw gray cast iron. (Steel wool strips seasoning — which is fine here, because you’re going to re-season anyway.)
Step 2: Wash with mild dish soap and warm water, scrubbing with the brush or sponge.
Step 3: Dry thoroughly with paper towels or a cloth (then a warm burner).
Step 4: Rub a thin coat of cooking oil over the entire skillet — inside, bottom, and handle.
Step 5: Put foil on the bottom oven rack to catch drips, set the skillet upside down on the upper rack, and bake at 350–375°F for about an hour to set the seasoning.
Step 6: Turn off the oven and let the pan cool inside before using. Repeat the oil-and-bake a few times for a more durable seasoning.
Pro Tip: How to clean a glass top stove.
How to get rust off cast iron with vinegar
For heavy rust, a vinegar soak dissolves it — but watch the timing, because vinegar will eat into the raw iron itself once the rust is gone.
Step 1: Mix equal parts white vinegar and water.
Step 2: Submerge the skillet (use a larger container or plug the sink for big pans; or just fill the pan if only the inside is rusty).
Step 3: Soak — but only as long as needed, checking every 30 minutes. Don’t leave it in for hours; once the rust dissolves, the acid attacks the good metal. Pull it as soon as the rust wipes away.
Step 4: Scrub off any remaining rust with dish soap and a brush or abrasive sponge.
Step 5: Rinse and dry immediately — bare, freshly stripped iron flash-rusts fast.
Step 6: Re-season right away (oil-and-bake as above). Never leave stripped cast iron bare.
Final thoughts
The rules for cast iron are simple: clean it while warm, salt-scrub burnt-on food, a little mild soap is okay, dry it completely and promptly (on a warm burner is best), and finish with a thin coat of oil. Never soak it and never put it in the dishwasher. Cared for this way, a cast iron skillet lasts for generations — the kind of pan you can pass down.