Came here to say this. But careful, the pleather will absorb stuff (oils from plasticine or putty, or alcohol itself) & the white coloring may be subject to marking or staining for the same reason.

Probably the safest is let it wear off.

As a curious art conservator however I'd first find what dissolves/removes the ink using Tic tac packets as my guinea pigs, and only then see if the same stuff works on the headphones (do safety tests first on an invisible part of the band)

Standard operating procedure: leave testing on the object itself to the last phase if possible.