Yea the front of my gas piston wouldn't come clean so I took some very very fine sand paper and got it clean. The gas pistion in the yogo I got seems to be stanless steal so it polished up to a mirror finish. I also made good use of a cosmetics brush when removing what little cosmoline was on my gun.
I figured a trip threw the washer would do it but I just wanted to make sure. That would be great if it comes with some rem oil. Do biger gun stores sell just rods, brushes, and patch holders as single items? If so what I'm thinking is that I will pick up a bore snake and a small rod, brush, and swab holder for the gas tube.