Can You Put Cast Iron in the Dishwasher? (No — Here's Why)

The short answer is no — never put cast iron in the dishwasher. It's one of the most damaging things you can do to a cast iron pan, and the damage is often irreversible. Here's exactly why, and how to properly care for your cast iron instead.

Why Cast Iron and Dishwashers Don't Mix

1. It Destroys the Seasoning

Cast iron cookware relies on a layer of polymerized oil called "seasoning" — built up over time through cooking and proper care. This seasoning is what makes cast iron naturally non-stick and gives it its characteristic cooking performance.

Dishwasher detergent is highly alkaline and abrasive. A single dishwasher cycle strips away years of built-up seasoning, leaving the surface dull, rough, and prone to sticking.

2. It Causes Rust — Fast

Cast iron is essentially bare iron with a protective seasoning layer. Once that layer is stripped by the dishwasher, the iron is exposed to water and oxygen — and rust forms quickly, sometimes within hours of the cycle ending.

3. The Heat and Prolonged Moisture Make It Worse

Dishwashers use hot water and steam, and dishes sit wet inside the machine after the cycle. This prolonged exposure to heat and moisture accelerates rust formation on unprotected cast iron.

What Happens If You Already Put Cast Iron in the Dishwasher?

Don't panic — cast iron is remarkably resilient. Even a rusty, stripped pan can usually be restored:

1. Scrub off the rust with steel wool or a stiff brush and warm water
2. Dry completely — put it on the stovetop over low heat for a few minutes to ensure all moisture is gone
3. Re-season the pan: Apply a very thin layer of flaxseed oil, vegetable oil, or shortening all over the pan (inside and out)
4. Bake upside down in the oven at 450°F (230°C) for 1 hour
5. Repeat 2–3 times for a solid seasoning base

How to Properly Clean Cast Iron

Proper cast iron care is simpler than most people think:

• While still warm: Rinse with hot water and scrub with a stiff brush or chainmail scrubber. Avoid soap if possible — if you must use it, use a tiny amount of mild dish soap and rinse immediately.
• Dry immediately and completely: Never let cast iron air dry. Dry with a towel, then heat on the stovetop for 1–2 minutes to evaporate all moisture.
• Apply a thin layer of oil: While still warm, wipe a very thin layer of cooking oil over the cooking surface with a paper towel.
• Store in a dry place.

What About "Pre-Seasoned" Cast Iron?

Even cast iron labeled "pre-seasoned" should never go in the dishwasher. The factory seasoning is a starting point — it still needs to be maintained through proper hand washing and oiling.

What About Enameled Cast Iron?

Enameled cast iron (like Le Creuset or Staub) is a different story. The enamel coating protects the iron from rust and detergent. Many enameled cast iron pieces are technically dishwasher safe — but hand washing is still recommended to preserve the enamel's finish and color over time.

Keep Your Dishwasher Running Clean

For everything that IS dishwasher safe, keep your machine performing at its best with a monthly cleaning cycle. The Affresh Dishwasher Cleaner Tablets (amzn.to/42P5MKQ) remove limescale, mineral deposits, and odor-causing bacteria from the pump, tub, and hoses — 6 tablets for a 6-month supply.

For everyday loads, the Finish Powerball Dishwasher Pods (amzn.to/3RE929j) deliver reliable cleaning in a plastic-free, pre-measured format.

The Bottom Line

Cast iron and dishwashers are fundamentally incompatible. The dishwasher destroys seasoning, causes rust, and can permanently damage your pan. Always hand wash cast iron, dry it immediately, and apply a thin layer of oil after each use. With proper care, a cast iron pan can last generations.