Some woods like rosewood, and even ebony to a lesser extent can be over oiled and can get soft. I had a customer, with a Strat with a rosewood board who would oil his board once a week, after about two months he was having problems with high frets and dead spots. because the fretboard was over saturated. Ebony isn't as porous and no normal person would ever use that much oil on their fretboard so its basically a non issue. I was just bringing up a point to the contrary of the importance of oiling the fretboard.
Unfortunately, this is true. A little oil applied and immediately removed will make the fretboard nice and pretty but not much else. If you're actually able to marinate by applying copious amounts and allowing to soak over time, you're running a greater risk of de-stabilizing the frets. The oil...any oil...will eventually seep beneath the frets, find end grain, and via capillary forces will wick-up the balance of the fingerboard. IME, this is most visually evident with rosewood boards: the board will retain an unnaturally dark hue adjacent to the frets long after the excess oil has been removed.
For cleaning, I prefer a soft cotton rag and Zippo lighter fluid (naptha). FWIW, I'm a Zippo loyalist as I used to live two blocks from the factory in Bradford, PA.
Riis
