When I was still involved with the Boy Scout Troop (both my sons are aged out), I found an old dutch oven and a couple of large skillets. They had been neglected, rusty, and just sad. Took them to the next camping trip with some fine sandpaper, some steel wool, some Scotch sponges (the green abrasive ones), Dawn, and some real lard obtained by a Troop dad who owned a restaurant. Sanded it all, scrubbed with steel wool. Washed with Dawn and Scotch pad. Let it dry to make sure we got all the rust. Built a nice fire a stuck the cast iron in. When it was good and hot, brushed lard on it all, then back in the fire. Put on a few coats of oil. Old times were impressed a young guy like me (I was 44 at the time) knew how to take care of the good stuff.