Sweat bad for rosewood?

I'd be more worried about eating the finish off a maple neck. I can't see the sweat being a problem unless your sweat is really corrosive, I'd just wipe the neck down after playing it.
it's amazing how much rosewood wears, I did a refret on my old strat and when we sanded and leveled the neck I couldn't believe the wear patterns, it looked like huge gouges.

 

I think you're grossly overthinking it, bro. I wouldn't use any sort of alcohol or naptha because it will also remove the lubricating oils that keep the rosewood from drying and cracking. And then you'll just end up re-oiling it and making it too soft after a while. Best to just wipe it down as good as you can and live with what you can't remove.

Or stick with painted maple.

 

Get the 64 if it's what you want, the 74 sounds different due to its 70s pickup spacing.

Keeping your rosewood clean is an aesthetic choice. The cleanliness of your fret*board* does not affect your tone. The cleanliness of your fret*wires* does, however. Polish them when you change your strings to keep your bass sounding bright, or don't polish them in order to get a duller sound.

All in all, you're worrying too much about something that doesn't matter. Worry less about the sweat on your fingerboard and start thinking of how you can put more on.

 

WWSHD? What would Steve Harris do?

Throw on a couple of wristbands sporting the good ol' Union Jack and rock that thing.

 

Holy crap............

To the OP, you're grossly overthinking this. Keep the rosewood clean and well-oiled, and don't worry too much about the rest.

 

Cut & paste from the "Ten Most Wanted Fenders" web site describing James Jamerson's 62 P bass, which BTW had a rosewood fretboard.

...To most other musicians, that bass was unplayable. Jamerson kept his action very high, and his neck was bowed due to lack of truss rod maintenance. He rarely cleaned his guitar, and he never cleaned the fretboard. To Jamerson, the sweat and dirt on the bass was the secret of his sound, the essence of the funk...

So apparently even a massive buildup of mung on the fretboard won't hurt.

There is also a topic somewhere in this forum regards wearing gloves while playing and the guy who inspired the topic wearing thin silk gloves because he produces a load of corrosive sweat and the gloves helped make his strings last longer, so that may be an alternative if you are concerned about goop on your neck.

Last of all. When I was young and could only afford someone else's old castoff bass I wound up with more than one bass sporting crud buildup around the frets. My solution was a worn out toothbrush and an old lightly dampened T shirt. If I hit some particularly stubborn crud, I'd dampen the brush with warm soapy water and scrub/wipe until the crud was removed. I did this on maple slabs as well as rosewood and ebony fretboards and never had any problem as a result of this cleaning. Most of the crud I was removing was not from lack of cleaning, but from boiling and oiling flatwounds thinking it would make an electric sound more like an upright, which was popular with country players when I was a kid. Either way, the crud was still a mixture of oils, sweat, and whatever random dirt/dust, etc., happened to wander by.

Go for the rosewood if it's what you want.

 

Wipe it down - use a soft toothbrush on the wood if you want to clean it up a bit.