Okay guys, Ive got a large heavy propane burner and about 65 lbs of coww and soww, separated. Verified all are lead with a pair of wire cutters on every piece...I finally got the last piece I needed which is an old large round cast iron pot (with lid). My question is pot preparation. It was used for cooking previously and is greasy, etc. What steps should I take to prepare the pot for melting, along with maintenance of it? I plan to melt the coww and soww separately and mark them accordingly btw. Thanks!