I clean skulls using dermestid beetles. The results are fantastic but the work is difficult!
Some Highlights:
The beetles need to stay between 65-85°F - below 65 they become sluggish, below 40 they die. Above 70 they are active but above 80 they can fly.
The smell of decomposing flesh WILL attract other unwanted insects.
The beetles are very susceptible to mites in too wet of an environment. This will hinder reproduction and may kill an entire colony.
After the bugs eat the flesh you will have thousands of bugs to get out of the skull - even when you think you are done, you will have hundreds trapped - it can take hours to get them all out.
The smell is strong enough to penetrate the fabric of your clothes and will carry with you in to the house/car/etc. Your wife won't like it!
I have a dermestid beetle start up document that I've created if you are interested, PM me.