I own several of these, along with some quality cleaning gear as well. I don't know how one would quantify cleanness, but I do know that the bore snake is not the correct tool for removing embedded fouling like copper. It's ok for removing light carbon fouling, but that's about it. And the "brass brush" section on mine is very hard and tight fitting in the bore, to the point that there's no way I'd run it through my better barrels for fear of gouging them.