Sean, I actually use orange oil on my fretboards every time I change the strings. It's pretty easy I just spritz a washcloth with the stuff and wipe it down. Re-humidifying a guitar? I did mine in about 2.5 weeks, with a humidifier in the guitar kept in a case. I have a whole house humidifier in the central air unit, in the winter I keep it at about 45%. However, I keep my acoustics in their cases so they need a little extra attention. The good thing about humidifying in the case is that you can easily tell when they're getting re-humidfiied, as you don't have to put as much water in the humidfier after a couple of weeks. I started out filling the thing every 2 days but after a couple of weeks, I only had to fill it about every three or four days then it didn't need much for a week then two weeks. Once the guitar starts getting rehydrated it doesn't suck it out of the humidifier at as fast a rate. Am I making any sense here? Anyway, it's a more controlable environment in the case.
New guitar case $40.
New soundhole humidifier...$10.
Acoustic guitar with no fret sprout, no cracks in the finish, and no pulled up bridge.....priceless.
Mastercard for the things you need right now......