I wipe the dust.
I have one euro mount from red deer (stag), dated 1968, which I inherited from grandfather.
That one had yellowish color of bone from ageing.
I removed it from the plaque, and applied peroxide 30% (standard chemical for scull whitening).
On application of chemical I heard the sound like the bone was cracking.
The scull did not crack, but the yellowish color was not removed either.
I aborted the attempt, and put it back on plaque, and back on the wall.
Since then, I just wipe the dust.