Those Mr Clean Magic Earser pads will dig the Ebony out of the grain of the holly fairly good.
However, if you seal the wood with a fast drying water based sanding sealer during sanding the holly will not have any grain pits for the ebony dust to lodge in.
You could use thin super glue to seal the holly for the first coat but that will darken the light colored wood a bit.
I use Endro poly water based sanding sealer.
The first coat takes about 15 min to dry cause I like it to be a heavy coat but the lighter coats after that dry in minutes.
Use a folded paper towel held to the bottom of a spinning cue with one hand and apply the sealer from a squeeze bottle to the top of the cue with the other hand.
Move down the cue in a steady motion.
The folded paper towel will spread it out fairly evenly.
Let it dry and sand .... then reapply and sand again.
Hope I explained this ... if you need a photo just ask.