I use bristle pipecleaners + Everclear until there come out clean. Don't know how it looks in there after but it always smokes good. Not thre first time I've heard this question - I am always looking for a better way.
I have two pipes that after deep cleaning I can still taste the nasty oxidation taste in. They are clean inside, yet still oxidized. Any suggestions on how to remove the oxidation from the inside of the stem?