A flea market dealer who specialized in cast ironware once told me that he used to build a large pile of wood and put all the ironware he had that needed cleaning on the wood pile, then set it on fire. The extreme heat from the fire cleaned the pots and skillets pretty well, up to the day when the fire was to hot and cracked a couple of dozen pieces. He said that someone told him to put ironware that was badly carboned up into a plastic container with enough water to cover them and put in 1/4 cup or more (not critical) of lye, available in most groceries. The pots need to soak for days, or weeks, depending. There is no odor, just be carefull not to spill the container. From time to time remove one of the pots and rinse it in cold water,hit it a couple of licks with a brillo pad, if the carbon is still adhering, put it back in to container for a while longer. I've used this method sucessfully for yearson a large number of items. Once the skillet or whatever is clean, rinse it throughly in running water then wash it in hot soapy water. This is the only time you should use soap. Rinse competely in hot water and set on LOW heat on the range to dry. Once all the mosture is gone, grease the interior with cooking oil, shorting or whatever. After use, just rinse out the interior with water. Any food particals that are stuborn will come out with a plastic scrub pad or a WOODEN scraper. A really well seasoned pot will be a joy; nothing sticks to it. Some foods will remove the seasoning, tomatos being one of them.