bushman, if you are worried about the velvet, it depends on what condition it is in. It it still has blood in it, that must come out, or it will begin to smell. They must be injected. Or, it can be freeze dried, or stripped and sent away to have artificial velvet applied. Both kind of costly.
If you are worried about the skull, you should probably do something besides bleach. Bleach will just weaken the skull bones.