These stubborn stems still have some faint greenish oxidation near the shank after doing the Oxiclean, magic eraser, sandpaper, polish and Obsidian sequence. They were fairly oxidized beforehand. I actually the repeated the soak for overnight after the first 800 sanding on these. What do you think I'm doing wrong? Oxiclean soak not strong enough? I put a scoop in about 12 ounces of water and stirred it up. On a later batch, I used one scoop in about a liter of water in a long pan for a churchwarden stem (it cleaned up fine). Should I go to something coarser than the 800 sandpaper for the initial sanding?
Here's a before picture of the bent bulldog (second from the left).
http://i1377.photobucket.com/albums/...psz9ryvbxw.jpg