you could also try a reloaders case polishing cloth. it has a pretty mild grit to it and has buffed out some minor rusting over the years.the key is prevention. as soon as you get out of the field or home the first thing you should do is get it out of the case and wipe it down. those egg foam linings in gun cases hold the moisture to the gun. i have also switched to the birchwood casey synthetic oil in the spout can and love it. no smell and great in cold weather. it leaves a nice film on the metal parts without feeling too slick. i always wipe down the barrel as i was told the oils in your hands will do damage to a dry gun.