Hey there SIFU, is it their little triangular stone? If so, you don't really need a lubricant, however it would probably help to use water. I found that mine seemed to "clog" easily when used dry, and I would have to wipe it off often. Water seems to work well in keeping it lubricated and clean. I suppose you could use oil too, but I haven't tried it yet as I don't know what kind of effect it will have on the ceramic.
"A sharp mind is just as important as a sharp knife."
"Is that a knife in your pocket or are you just happy to see me?" "Both"
I clean my Spyderco Sharpmaker's ceramic rods with a toothbrush and toothpaste. Scrub until all traces of steel are gone, and rinse with warm water. Works for me.
I don't use any lube/water with ceramics. No need.
Eric - Usual Suspect
"The best toys are the ones that you can put an eye out with."
I use a simple pencil eraser on my sharpmaker. It does not get it as shiny white as the rods came NIB, but neither did any other method (still very new rods). The advantages of erasers are, IMHO: always at hand (no need to run to the sink every so and so minutes), fast and no mess with any lubricants whatsoever...
Has anybody else tried this?
Rust erasers work fine on mine. I've tried regular erasers, the blue Staedtler--you should know this one Seb--erasers (the one we use to erase pen marks) work fine too. Make sure you use the blue ones (rather coarse when you touch it), work better than the transparent and soft ones.