I use the maintenance kit by Dunlop and its work perfectly and I never had problem in years with it. You can basically treat it the same as any rosewood fingerboard. It's a bit more dense, grain-wise, but it's still a more porous wood than say Maple, so any typical cleaning method you'd use for an open-pore fingerboard works fine. So lemon oil, naptha, gorgomyte, any of that usual stuff.
Hi everyone, I recently bought a late 80's mirage deluxe for a bargain price so could not resist, any way this has an ebony board too and when I got it I was just doing usual maintenance cleaned the board etc then I noticed playing it after my hand was filthy so I'm guessing they do dye the boards but I'm cool with that it's no reflection on quality.
Ebony isn't always jet black it can be slightly brown but I suppose a lot of people want jet black so maybe they dye them to be more appealing.