I use MET-ALL polish, works great, is cheap and acan should last a lifetime. It says for aluminum but it does work great on steel. I found it at this site for fairly cheap. MET-ALL Polish for Aluminum (16 Oz. Can) The largest selection of Aircraft parts and Pilot Supplies.- SkyGeek.com
http://us.st12.yimg.com/us.st.yimg.c...2042_357195644