Obsidian oil= Marketing? Why pay ten times the cost when plain mineral oil is readily available and does the job fully?
Someone here (DaveG?) recommended to me the Magic Eraser, when working around a stamped stem logo. It worked surprisingly well, leaving the logo very much intact.I also might pick up some more Magic Erasers. They worked like a charm on the last oxidized stem I worked on. It's sad that I'll likely lose the trademark CP on the stem due to oxidation and having to remove it around it.