This stuff is great for keeping your rosewood fretboard looking like a million bucks. This keeps my rosewood properly hydrated so that the ebony color will shine. It makes the fretboard smell nice and fresh. My cleaning regimen: 1. take off strings 2. clean/wipe dirt or grime off entire guitar first with microfiber cleaner cloth 3. after cleaning off the dirt/grime, apply guitar polish to guitar body 4. use Ernie Ball fretboard conditioner on fretboard.
I find that one Ernie Ball fretboard wipe has enough juice to hydrate two guitar fretboards at a time. I have guitars with rosewood and maple fretboards. I recommend using this stuff on your rosewood only. Not recommended for maple fretboard, trust me on this one.