Scrub off stuck-on bits: To remove stuck-on food, scrub the pan with a paste of coarse kosher salt and water. Then rinse or wipe with a paper towel. Stubborn food residue may also be loosened by boiling water in the pan. Dry the skillet: Thoroughly towel dry the skillet or dry it on the stove over low heat.
I agree with Em, except I use oil vs water with the salt to scrub. After drying on low heat don't forget to apply another light cost of oil to reseason.
I recently used barkeeper's friend and steel wool to remove build up off some old pots.
Another option that worked well for me was marble paste or an SOS pad.
No matter what you do, there's a lot of "elbow grease" involved.
I would help it out by soaking in a blue Dawn and boiling water solution.
I will try it and let you know what happens
Here are some options for you.
Mine are all well seasoned and haven't seen a lick of water in decades, however I do toss into a campfire every now and then.
Hi Jassodra - This is a great tutorial on how to clean, season, and care for cast iron skillets. Hope it helps! Hugs, Holly
PS - We have a FREE eBook with recipes for all of my homemade and all-natural cleaners. You can download it here --> https://pinkfortitude.com/thank#GreenClean