I never foresaw what became one of, if not the most, satisfying parts of my job: the cleaning of a dead-skin packed, oiled ridden and dirt covered fret board!
There is nothing like taking a fresh razor blade and skimming the top of a truly grimy fret board. Removing the thick layer of filth and polishing the frets. Graduating grits of sand paper, moving on to 0000 steel wool. Then applying some fretboard oil to then step back and revel in a fretboard that came in looking like dark ebony and turned out be figured rosewood.
Ah yes, the simple pleasures of luthiery.