Time to get out the notepad and pen (or hit print)...because If I'm going to bother typing this you can take it to the bank that this is the ONLY and BEST way to clean a skull if you don't have access to bugs. I have tried them all, and this one works best.
1. Don't fret about taking all the meat, brains, etc. out before hand. Get what you can.
2. If you don't mind some smell, it doesn't hurt to let the skull "ripen" a bit. I usually wrap in plastic bags and let them sit for a few days. Not necessary, but speeds up the process a bit.
3. NEVER BOIL, as in don't ever BOIL a skull.
4. Get some sal soda (washing soda). I usually put 1-2 cups in my (large) "boiling" (again don't boil a skull, EVER) pot. Simmer for a couple hours. The key here is the washing soda, the cartilage, meat, etc. will literally start falling off and you don't need to scrape, power wash, use brushes, none of that B.S.
5. Replace water, this time I usually put just a bit more sal soda (not much) and about a half bottle of dawn, and dawn dish soap only. Simmer, did I mention to NEVER BOIL???, for a few hours. For greasy skulls like bears, I usually repeat this step to make sure the grease is all pulled from the skull.
6. Go to a Sally's or some other beauty supply store that has hair salon stuff...pick up a gallon container of 40 volume crème developer, while you're there, get a container of basic white (powdered stuff). Trust me on the gallon size, you'll be doing this every time you do a skull from here on out.
7. Fill a plastic bowl with basic white and mix in the crème developer...it should be smooth, thickish paste. Be careful to NOT get any of this on antlers, unless you like white antlers. I use a paint brush and paint the mixture all over the skull, don't get cheap, apply it pretty heavy. Wrap the skull in plastic bags (I usually use plastic grocery store bags for deer and pronghorn, use tall white kitchen bags for elk). Walk away for 3-5 days.
8. Open bag, rinse the skull in water and let dry.
Results:
Couple three pronghorn:
Without bugs, this is the only way to fly...you don't miss any of the bones and don't have to scrape, power wash, any of that non-sense.
It does take some time, but the skulls come out very good.