I just made a PEX manifold (with copper 90s and t's) and used the straight end of a stainless steel racking cane to clean up the burrs on the inside. It worked pretty good. Then I used a brush to clean up the smaller stuff. On the outside I just used a straight blade knife.
Old post, I know, but then again I don't know why people have problems with someone resurrecting an old post.