I know, here we go again.
Almost all reloading manuals say to clean brass to keep the wear on reloading dies to a minimum. The opinions on the 'Fire are pretty well split between "I like 'em shiny" and "Who cares?" Some of the gun writers only clean the ones they're taking a picture of.
Realistically, unless a case is black from having been out on the range for way too long, is there any credence to dirty cases (not sandy, just tarnished with some carbon around the neck) causing wear and tear on a die?
Thanks.
RM