So far using Bon-Ami and Scotch-Brite has produced the best results on dirty ceramic rods but I tried some oil last night and it worked very well. I used some honing oil and a synthetic steel wool pad, and the rods cleaned up what seemed like instantly. They also seemed to work well with oil, not clogging up almost instantly like they do when used dry. I'll keep using oil for awhile to try it out as I already use it on my other stones.