Sorry. this link seem to be indirect.
Here's the excerpt from the site....
I found a bone, how do I clean it?
First of all, don't boil or bleach bone! Boiling causes fat to soak into the
bone, resulting in a greasy, yellowish specimen. Superficial grease can be
removed with ammonia and certain industrial solvents, but this is an unpleasant
process and cannot remove deep grease which will eventually migrate to the bone
surface. Chlorine based bleach irreparably damages the bone itself, resulting
in chalky, weak, extremely porous specimens that will turn to bone meal with
So, how do you really clean bone?
Maceration - Using bacterial action to clean bone
This is the simplest method of cleaning bone.
Remove any remaining tissue or hide from the bone
Immerse the bone in a container of water.
Leave the container in a warm location where you won't mind the smell.
Periodically pour the greasy, smelly water out (gardens love it!) and replace
with fresh water.
When the water runs clear, the bacteria have run their course.
Soak the bone in regular drugstore strength hydrogen peroxide until it
reaches the whiteness you prefer. This also sterilizes the bone.