Same here, Squier CV laurel fretboard, grey and lifeless, ruined the whole appearance of this otherwise gorgeous white bass.
I lightly but thoroughly sanded the fretboard with extra fine grit sandpaper to remove any finish, which I think there was as the sandpaper would gunk up every few frets at first. Then the Dunlop fretboard oil. The board is now dark and lustrous.
The big surprise is the tone changed. It used to be cold and hard, now it is noticeably warmer and rounder, almost like the fretboard went from plastic to wood.
I’m thinking of sanding my new CV late 60’s.
Do you have any pics?
Approximately what grit paper?
Did it scratch the dots or blocks on yours?
It seems mine has a finish on it. Above the nut it’s very dark but in the fingering area it’s grey and cloudy.
Any tips or hindsight is appreciated!