You may find bleach will break down the skull, making the surface more porous, the skull more brittle, and the plates may well come apart. Also will not get it anywhere near as white as peroxide will. Depends if the skull is important to you, it will do the job but not be as good and may mean you have to glue pieces back together.
I wouldn't if I were you, pop out to the chemist and buy some more, bleach disintegrates bone over time, although it might not appear to in the short term, it can do later on....
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