I use Lapua brass for nearly all my rifles. Brass starts out clean & shiny and is handled with care. Before reloading I clean the inside/outside of the necks and clean the primer pockets. I never bother cleaning the case itself. The exterior of the case remains clean from firing to firing, just not as shiny as new. Never had a problem. I was wondering, is there any reason to remove the fouling/powder residue from the inside of the case? I see that the new stainless steel pin tumblers do an excellent job of cleaning the inside of the case; but is there a need to do this?