Dan, take a little lighter fluid on a paper towel and carefully wipe off any excess marker. If you're more careful than I am you may only get it in the honing area but I tended to get it up above there too when I used to use it. I rarely do anymore. Just haven't needed to in a pretty good while but it is a good method for seeing where you're at if you're not sure.

Also , the lighter fluid is good for removing tape residue when the spine is taped. Don't make the same mistake I did and leave tape on overnight after a honing session. It may etch a line into the blade where the tape ends and it is sometimes very difficult to remove the mark. Peel it and clean when the session is done and you'll not have that problem.