How to Clean a Rusty Cast Iron Skillet

Instructions for how to clean a rusty cast iron skillet. After thoroughly cleaning, we will also tackle how to season a rusty cast iron skillet.

I am a cast iron cookware devotee.  

I do like my stainless steel cookware, but when it comes to non-stick, a cast iron is my go-to pan. Truthfully, well-seasoned cast iron cookware is not as ‘non-stick’ as some other “Non-Stick” labeled cookware. But I’m too suspicious of the chemicals and processes involved in making the ‘non-stick’ feature of other non-stick cookware.  I’ll always default to a low-tech, no chemical, tried and true item that’s been safely used since the Han Dynasty (206BC-220AD).  

In addition to the set of 4 Lodge 5-inch cast iron skillets that I’ve written so fondly about (skillet apple crumble, skillet brownie, skillet pecan pie, individual almond fig clafouti); I also regularly use a Dutch Oven, a  10-inch skillet, a 12-inch  skillet, and a 2-sided grill/griddle.

All that being said, you can’t just throw your cast iron skillet in the dishwasher or, for that matter, just wash and forget it.  So this is where I got stuck (no pun intended) on my cast-iron learning curve.  Of course, I never put it in the dishwasher!  But I know I didn’t ‘tend’ to it regularly as I should have.  

My skillets are actually in pretty good shape, but the lid of my dutch oven became rusted on the inside because I didn’t make sure it was dry when I put it away. And my grill/griddle was just a hot rusted cast iron mess because I seasoned it poorly several years back.  

I recently decided it was time to rescue my rusted cast iron and resolve to be a better cast iron owner.  To that end, I researched how to clean a rusty cast iron skillet.  I realized that I needed to take off whatever finish remained on the dutch oven, its lid, and the griddle and start from scratch.

How to Clean a Rusty Cast Iron Skillet, Pan, or Griddle:

Before we dive into how to season a rusty cast iron skillet, let’s first discuss how to clean it.

• With your cast iron cookware in your oven, turn the oven on to the self-clean mode.  The approximately 850° temperature of self-clean mode carbonizes and turns to ash the finish, build-up, and dirt from your cast iron and oven.
• Once it is cool, use a 2″ wire cup brush or 2″ wire wheel brush drill attachment to remove any remaining rust on your cast iron item.  The two together cost less than $10.  If your cast iron is not as bad as mine, you can probably use a wire brush instead of the drill attachments.
• Once you feel you’ve nailed all the rust on your cast iron with wire brushes, give your cast iron a good rinse with water, but don’t use soap.  
• Dry the cast iron off, then put it in the oven to thoroughly dry it and warm it up. I set my oven to 450° and put the cast iron in when I turned the oven on and ‘baked’ it for about 5-10 minutes.

How to Season a Cast Iron Skillet, Pan or Griddle

• If you haven’t already done so, set your oven to 450°F.
• Thoroughly rub your clean cast iron with a seasoning oil. Pop over here for a list of good oils for seasoning cast iron. Keep the layer of grease as thin as possible.  I tried using paper towels (the lint/fibers got all in the grease), a bristle basting brush (the bristles fell out and got in the oil), and a silicone basting brush (just a pain in the neck).  I finally realized the best solution was getting my hands on the cast iron and rubbing the grease all over it.  PLUS…my skin was so soft after the process!  As a warning, you want to do this when your cast iron is warm but not so warm that you can’t rub your hands all over it. 
• Place your cast iron in the hot oven and let it bake for one hour.
• Remove it and let it cool enough so that you can rub another thin coat of oil over it.
• Return it to the 450°F oven for one hour.
• Repeat this process several times, 5-7 times should be enough for a wonderfully slick, non-stick surface.

I did a deep dive into the different oils that you should and shouldn’t use when seasoning your cast iron in this post.

TADA!!  Will you look at that shine!!  That’s pure non-stick goodness right there!!

How to Keep Cast Iron Well-Seasoned:

• After each use, dry your cast iron, heat it slightly on the stove and rub oil over the cooking surface.  Wipe off excess oil with a paper towel (or soy ink newspaper), let it cool, and then store it.

Lessons Learned:

• I read somewhere that you could do it outside on your grill instead of baking the cast iron in your oven. So, I thought ‘What a great idea!” and turned my grill on.  Here’s the rub…my grill thermometer doesn’t work very well…I guess.  After one hour, my grill/griddle looked like it did after the self-cleaning mode. The heat from my grill removed the oil I had just put on. Obviously, my grill was hotter than what the thermostat claimed.  Plus, the whole thing is having indirect heat in the oven versus direct flames on the grill. At the end of the day, I figured I was better off doing it inside and dealing with the burnt vegetable oil smell.  Luckily it’s a cool day, and I can open the windows.  
• Keeping it a thin layer is key, no matter what oil you choose. I went astray in past cast iron seasoning attempts because I had too much vegetable oil, which puddled or baked unevenly.
• After thoroughly coating your cast iron with your preferred oil and removing any excess, put your pieces in the oven.  I put my Dutch oven upside down so any runoff wouldn’t puddle on the bottom of my pot.  You may also want to put a cookie sheet lined with aluminum foil at the bottom of your oven to catch any drips.
• Let your cast iron cool to the touch but still warm, and repeat the greasing/oiling and baking process 2-3 more times.  
• Now that I’ve cleaned my cast iron and re-seasoned it, I am determined to keep it well-seasoned regularly. It will be easier than going through this process again.  
• Plan to invest several hours; 4 hours for the self-clean cycle and 3-4 for each 450° ‘baking’ cycle…up to 20 hours total baking time.  Although you are not actively involved most of the time and the process can be spread out as long as you need, why bother if you keep it well-seasoned?  (Can you hear me motivating myself to do a better maintenance job?)

Cleaning my cast iron was on my to-do list for some time, and it feels good to scratch it off. 

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