Should You Use Soap on Cast Iron? (Here’s the Truth)

Cast iron skillets and potjies have a special place in many kitchens. They’re tough, they cook beautifully, and if cared for properly, they can last for generations. But one question sparks more debates than pineapple on pizza:

Should you use soap on cast iron?

For decades, the answer was a firm no. Soap was considered the enemy of seasoning. But modern cooking science tells a different story. Let’s clear up the confusion once and for all.

The Old Rule: “Never Use Soap”

For years, cast iron owners believed soap would strip away the seasoning (that glossy, nonstick layer made from baked-on oil). Back when soap was harsher—often containing lye—that fear made sense.

The advice passed down from grandparents to new cooks was simple:

• Scrub with salt

• Rinse with hot water

• Never let soap touch the pan

But is that still true today?

The Modern Truth: Soap Won’t Ruin Your Cast Iron

Here’s the good news: a little soap is safe for cast iron.

Why? Because most modern dish soaps are designed to break down surface grease, not hardened polymerized oil (the scientific term for seasoning). That means your skillet’s protective coating isn’t going anywhere with a light soapy wash.

When to Use Soap on Cast Iron

You don’t need to grab the soap every time. Most of the time, hot water and a stiff brush will do the trick. But soap can be useful in certain cases:

• After cooking something sticky, like BBQ sauce or eggs gone wrong

• If you’re worried about lingering flavors (fish, garlic, strong spices)

• When you want peace of mind before cooking for guests

The Best Way to Clean Cast Iron

Whether you use soap or not, follow these steps to keep your skillet in top shape:

1. Clean while warm – Wipe out food bits with a paper towel.

2. Scrub gently – Use hot water, a brush, or a little soap if needed. Avoid steel wool unless you’re reseasoning.

3. Dry completely – Water is cast iron’s enemy. Place it on low heat to evaporate moisture.

4. Oil lightly – Rub a thin layer of cooking oil onto the surface to maintain seasoning.

What NOT to Do with Cast Iron

• Don’t soak it in water (it will rust).

• Don’t put it in the dishwasher.

• Don’t scrub with harsh detergents daily.

• Don’t store it without oiling after washing.

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