There's lots of 'stuff' out there to clean guitars and fretboards but I have yet to use any of 'em. There are many issues with guitar finishes and I just haven't taken the time to see what is (allegedly) safe for my two guitars. Besides, I reason if I keep the guitars clean to begin with I won't have to mess with the stuff to clean, polish, etc. Others may have a different experience. I have found cleaning recommendations from the manufacturers of my two guitars so I suggest you search the online site of yours.
After play, I wipe down the guitar (strings and fretboard included) with a clean soft dry cotton cloth (I found mine in the auto section at WalMart). Then the guitars go back in their cases without their straps.
On a weekly basis I use an electric duster (a small handheld vacuum that blows instead of sucks) to get rid of dust and other loose crap, a string cleaner called...wait for it..."The String Cleaner"
http://thestringcleaner.com/ , and then I wipe down the body and palm-side of the neck with a miracle cloth (micro fiber) dampened with distilled water. I go over everything once again with the drier part of the miracle cloth.
I told you I baby'ed by guitars. :)
p.s. Fretboard cleaning is, to me, the downside of changing strings one at a time. It'd be a whole lot easier to clean a fretboard with all of the strings off. ;)
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins