I suppose if there's real grunge on the fingerboard, I'd clean it. But barring anything gross, I don't see the point in cleaning the fretboard, and the term "conditioning" implies to me that the board needs to be "conditioned," which I believe it does not.
Sure some folks' hands sweat, and this not only creates dirt but can also be caustic, so yes, cleaning here is prudent. But the overwealming number of posts I've read over the years regarding cleaning/conditioning the fretboard always seem to imply that the neck needs it. The board
needs proper humidity, but as for "needing" oil or "conditioning," that jury is still out. Read up on it and you'll find many convincing POVs on both sides. But after mannnny years, over many guitars (of varying board types), I've come to my personal conclusion that proper humidity is all the guitar board really needs. Anything one applies is merely topical and largely cosmetic (not that this is bad, but let's not confuse an aesthetic desire with an actual necessity).
And as for ebony, which concerns us here since this is all Taylor uses, fuggetabout it! This is a tough, dense wood. Anything you put on and wipe away is exactly that: being
wiped away as precious little (if anything) is actually being absorbed. And there's nothing to gain aesthetically since you don't really darken ebony like some folks like to darken rosewood (except for figured or otherwise "special" ebony species, that is).
Sure this is all IMHO, but I just thought I'd toss in my two cents (FWIW

). BTW, I own FretDr oil ...good stuff that looks great on my rosewood boards. But I've used it very sparingly in the past, and have (in the last two years maybe) stopped using it altogether. Why? I just didn't see the point, honestly. It didn't "do" anything for the wood that I can tell, the board feels/behaves just as good without it, and I figure the shade of the wood is the shade of the wood and I should just accept that. It's all very liberating, actually. One less thing I have to do. Just restring and go. And I can appreciate the guitar just as well, if not more so. And yes, again, all IMHO

Edward