How to Deep Clean a Cast Iron Skillet: Step-by-Step Guide

By Avi Green October 14, 2023

Cast iron skillets are a beloved kitchen tool, cherished for their ability to conduct heat evenly and last a lifetime. But to keep your cast iron skillet in top shape, you need to know how to deep clean a cast iron skillet. Let's dive into a comprehensive guide that will help you maintain your skillet's integrity and longevity.

The Need for Deep Cleaning

Deep cleaning your cast iron skillet isn't an everyday task, but it's crucial for removing stubborn residue, old seasoning, and ensuring a smooth cooking surface. Regular cleaning methods may not always be sufficient, especially after cooking greasy or sticky foods.

Materials You'll Need

Warm water
Non-metallic scrub brush or sponge
Coarse salt
Baking soda (optional)
Mild dish soap (optional)
Paper towels or a clean cloth
Oven
Vegetable oil or shortening

Step-by-Step Guide to Deep Clean a Cast Iron Skillet

1. Remove Loose Debris

Start by washing the skillet with warm water and a non-metallic scrub brush or sponge to remove any food residue and grease. Avoid using soap unless absolutely necessary, as it can strip the skillet's seasoning.

2. Scrub with Coarse Salt

Pour a generous amount of coarse salt into the skillet. Use a paper towel or a clean cloth to scrub the inside of the skillet. This abrasive method helps to remove stubborn residue without damaging the skillet's surface.

3. Rinse and Dry

Rinse the skillet thoroughly with warm water to remove the salt. Dry it completely using paper towels or a clean cloth. A wet skillet can lead to rust, so ensure it's entirely dry.

4. Apply Baking Soda (Optional)

If your skillet has tough, cooked-on food, sprinkle some baking soda over the problematic areas. Scrub with a non-metallic brush or sponge, then rinse thoroughly and dry.

5. Use Mild Dish Soap (Optional)

If the skillet remains greasy, use a small amount of mild dish soap. Clean the skillet using warm water and a non-metallic scrub brush. Rinse well to remove all soap residue and dry thoroughly.

Restoring the Seasoning

1. Heat the Skillet

Place the cleaned skillet onto the stove over low heat for a few minutes to ensure all moisture evaporates. This step prevents the formation of rust.

2. Apply a Thin Layer of Oil

Using a paper towel, apply a thin layer of vegetable oil or shortening to the entire surface of the skillet, including the handle and bottom. Make sure to cover all areas to protect against rust.

3. Bake the Skillet

Preheat your oven to 350F (175C). Place the oiled skillet upside down on the oven rack, with a sheet of aluminum foil on the rack below to catch any drips. Bake for one hour, then turn off the oven and let the skillet cool inside.

Maintaining Your Cast Iron Skillet

1. Clean After Each Use

After cooking, clean your skillet promptly with warm water and a non-metallic scrub brush or sponge. Dry thoroughly to prevent rust.

2. Avoid Soap and Abrasive Cleaners

Soap and abrasive cleaners can strip the seasoning of your skillet. Stick to using only water and non-metallic scrub brushes for regular cleaning.

3. Re-season Regularly

To maintain a non-stick surface, re-season your skillet periodically. Apply a thin layer of oil and bake as directed in the seasoning steps above.

FAQs on Deep Cleaning Cast Iron Skillets

1. Can I use soap to clean my cast iron skillet?

Yes, but only use a small amount of mild dish soap if absolutely necessary. Regular use of soap can strip the skillet's seasoning.

2. How often should I deep clean my cast iron skillet?

Deep clean your skillet whenever you notice a buildup of residue or if food starts to stick. This could be monthly or after cooking particularly greasy or sticky foods.