I have wanted to use cast iron for a long time, so my husband went out the other day to a garage sale and picked a couple up. One is a Griswold #6 and the other is a Griswold skillet. The skillet has rust on the bottom and is flaky, and the #6 needs cleaning and seasoning also. What do i need to do to clean them up and season them so the can be used? Also after they are seasoned how do i keep them that way so they dont get rusted or sticky. I do know not to leave them in water! Any help would be appreciated.