Quoted from Rdoyle1978:Walnut is great as a cleaner, and it really does a great job polishing too if you add a little bit of Novus 3 to the mix. I pretty much just use that all the time. I mayhave to try Corn Cob eventually...
I don't have a lot of experience with corn cob, but the one time I tried it, it seemed to do the same as walnut shells but took a lot longer.