I have searched, both TB and the Internets, and I must be doing something wrong...I cannot find any definitive information or a simple answer... I have a used Fretless MIM Jazz (Allparts neck) and the previous owner had it strung with rounds. There is some minimal string wear that I would like to remove. I have a radius sanding block and stacks of sandpaper of varying grits, colors, etc. What's the best way to smooth out the fretboard and remove the string wear? I know to sand the length of the neck in long smooth motions, but what grit(s) should I be using? 200/400 or higher? 000 or 0000 steel wool? Thanks in advance.