I have always used a store-boughten "guitar polish" like Gibson or GHS on my 31-year-old J-50. I give it a good going over when I change strings and then keep the slightly damp cloth in my case (NOT in contact with the guitar), which then I use to wipe down the strings after playing. (The cloth, not the case.) I have no idea if it helps the string life but it does seem to cut down on the finger-grabbing crud that otherwise grows on my strings. Haven't had any issues with the fingerboard or frets in all this time. As for WD-40, realize that many electrics have the fingerboards completely lacquered over, on top of the fret wires, and will be pretty impervious to activities that would trash an acoustic fingerboard. Caveat polishor. -HM
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