And even then, I REALLY can't recommend using any kind of cleaning compound on an open-grained fretboard like that. Masking tape + 0000 steel wool may take a little longer, but is ultimately less bad for your fretboard.
You probably won't need to worry about tung oil - is your RGA an oil finished body, or just a matte trans finish? Either way, unless the wood starts to wear down leaving it alone is probably fine. And like 99% of all Ibanez necks ship from the factory with a heavy clear on them, so you won't need to oil the back of the neck - the neck is already finished, there's no need to apply a new finish.
The fretboard, different story. Lemon oil or woodwind bore oil are both great.
If you want to get deeper into this stuff, here are the two sources I learned most of what I know from:
IBANEZ RULES!! tech - setup
http://www.jemsite.com/articles-menu/tech-setup-questions/