Whatever works. But if the stem has oxidation and vulcanite is not being removed, nothing useful is going on. I don't see the point of using bleach or oxy because ultimately the diseased material needs to be sanded off. In my experience, bleach made things worse with it's pitting. Walker Pipe Repair put it very succinctly on their site, "Bleach destroys vulcanite."
My chief gripe with people using buffers is that only a tiny percentage actually know how to use one correctly and the rest just commit crimes against pipes. I say this as someone who used buffers daily for a decade when I was a manufacturing jeweler and restored important antique pieces going as far back as the 17th century.
Dremels have their place, I have a crapload of Dremel tools that I use, but buffing a long surface like a stem isn't one of them.
CA is a crap choice because it doesn't reliably adhere to vulcanite. Fortunately you have a couple of experts, Georged, Rustie and ssjones, who really know their stuff. Ca isn't what they use. They use G-Flex.
Unfortunately, protecting logos can be difficult, but not impossible. I'm very careful when I use micromesh pads, not to erode the stampings. One thing that I like about micromesh pads is the fine control they allow me.
