Hi. I recently bought a used Ibanez SR706 from Guitar Center. Love the bass, love the tone, but the neck is a tad grody tbh. I cleaned the fretboard with F-ONE from Music Nomad and it did an admirable job. However the *BACK* of the neck is still an issue. You can rub the neck with slight thumb pressure and it the dirt(?) will kind of roll up. The end result is a neck that grabs the fretting hand a bit; it's not terribly slick. The SR706 has a "five piece jatoba/bubinga neck" which doesn't really help me too much when trying to find a viable cleaner. It appears unfinished, as in it's not like the slick coated maple necks I am normally accustomed to. So what is the best coarse of action/product to clean the back of the neck? I've seen naptha recommended, lemon oil, even Windex. Not really knowing anything and about the care and feeding of jatoba or bubinga, I'm hesitant to experiment. Hopefully someone here on TalkBass can answer in the affirmative. Thanks in advance!