Corn cob will make the brass shiner than walnut but it still cleans them up. Rice also will work in the tumbler if you need something in a hurry !
NU FINISH car polish makes them shine well when added to corn cob. It can be bought at an auto store.
I used corncob in my tumbler with some brass cleaner I got from Cabelas. my brass was really dirty and I tumbled them for about 2 hours and they came out nice and shiny. make sure you leave the old primers in so the media doesn't get stuck in the flashhole.
On one of the site I visit, the guys are using white rice ???? I've never used it but a lot on the site swear by it..?? Can't hurt and it first cheap, they are even using it to take off case lube instead of wearing out your wrists...rice is the way !
I have had RICE pack solid into some cases and you have to dig it out of them. I would only use it if i have too, due to running out of other stuff.
CAR POLISH- Make sure it has no AMMONIA in it !Read the label?
I decap with a dedicated decapping die, brush out the residue with a primer pocket brush and then clean in corn cob media with Cabela's brass polish added. I tried walnut hulls before and I find it way too dusty.
After cleaning the cases I lube and size which is when any corn cob media that may be lodged in the flashhole is pushed out by the decapping pin.