A lot of reloaders add NuFinish to their corncob. It is a cleaner/wax designed for autos, and is sold at the local auto assy. shops. It is cheap to purchase, and a little goes a long ways. I purchased some a while back, but have not tried it just yet. Some swear that the wax layer aids in sizing, and also stops/slows the tarnishing of the shiny brass. I can not confirm that info at this time.
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