I use good ol' fashioned elbow grease and water, and a super fine steel wool for the unfinished fretboard. Polishes frets at the same time. Next, to condition the fretboard, I use natural boiled linseed oil. Works 1,000 times better than lemon oil I used to use.
I've used naptha to clean an ebony fretboard, and honestly... It wasn't very effective for me. Still required as much elbow grease as a damp cloth. So why risk it, when there is so much debate... That's the conclusion I came to.
As always, YMMV. I'd highly recommend boiled linseed oil to seal and condition ebony and rosewood fretboards, though.
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