I've searched and found volumes of opinions on oiling fretboards for maintenance, and don't want to rehash any of that I just bought a '78-'81 (not sure from serial# but 20+ yrs old) Fender P with a rosewood board that looks like it's never been oiled. There was some gunk buildup and I cleaned it off with naptha. About 90% of the wood sufrace looks grey and very dried out. I'm worried that this neglected wood will drink up anything I put on it, possibly pushing the frets out. I suspect this may require a slow process with several steps... any advice on how should I approach restoring this fretboard? TIA.