On Sun, 19 Mar 2006 18:51:41 -0800, with neither quill nor qualm, Don Bruder quickly quoth:
It's easy. I loved my cast iron on the gas stove in my last house. I wish I'd brought it with me but I left it there. (Slapping self.) The new electric stove is great, but it doesn't cook anywhere near as well as the old Merritt De Ville, a 400lb job from the 20's. I miss that old stove more than I do Vista or California.
I heat up the pan to good-'n-hot, turn off the burner, and pour 1/2 ounce of cooking oil into it. I spread that around until the entire inside is coated and let it cool. It's ready to cook the next day. (or 30 minutes later, after it has absorbed the oil.)
Right, no soap, no brillo. Boil it clean, sometimes twice, then scrubber it out, rinse, and put on the fire to heat. Season as above.
I don't eat pork so I don't use lard, bacon, or other junk fats.