I don't think that stem is Brylon. The Brylon patent is held by Medico which is currently owned by Kaywoodie as a sub-brand, and it's some kind of resin composite used to make the bowls, not the stems, and is out of production. It was heavy and burned hot. However, a few Forums members liked it because of its durability in rough and dirty work situations, since the pipes were indestructible and could be washed with a dish brush. For about 40 years, Brylon pipes held on, very low priced and often scorned, but they were finally discontinued about ten years ago. That pipe is probably an MM cob, or a knock-off, and the stem is likely acrylic or lucite, and I'd stick with dish detergent, since it is bright and clear and only needs cursory cleaning not a chemical bath that might cloud it up. The stem is pretty; don't mess it up.