Place the rusted cast iron pan into a container large enough to cover with coke.
Pour coca cola over the pan until immersed.
Leave the pan in the coke overnight.
Remove the pan and wash in hot water with Dawn dish washing liquid to remove remaining rust.
Rinse and dry with a cloth or lint free paper towel.
Season pan once again by coating completely with a very light layer of oil- not enough to drip or run when placing upside down. **Since this was a corn stick pan, I made sure that I added oil to each well, brushed it with a silicone brush and then turned it over and drained the excess before baking process. Make sure that you have a light coat...heavier coats will create a gumminess to your seasoning. Preheat oven to 450°.
Cover the bottom shelf of your oven with a piece of aluminum foil.
Place the cast iron upside down directly onto the baking rack in the oven and bake for one hour.
If the pan comes out a bit gummy, you may have used a bit much oil. Place back into the oven for another hour until the stickiness is gone.
Turn the oven off and let the cast iron cool completely in the oven.
Once its seasoned, it's ready to use again.