OK in the bee keeping world they say that anything works but you need to work the entire system, not just parts of each. After watching a bunch of YouTube and reading through just about every skull post on this forum I am going to tell you what I do, what I plan on doing this year and next and ask for some advice. Home from the trapline and skin. Skulls go into a bucket of water right after (keeps the skull wax down) Usually, same day I put them in a crock pot on simmer overnight. Next day the flesh should be cooked enough to pull the lower jaw off and all the meat with it. I just get right in there and all the ‘meat’ goes in a garbage bag. The teeth usually come out and go into a plant grow bag. Small cheap power washer cleans out the brain cavity, jaws, eyes. Pretty clean at this point they go into a ‘prep bucket’ usually of water, dawn soap, borax and some Oxyi clean. Heater on to about 85 (max for the little hang on side). I have been putting them into a seafood boil bag to keep from as much trouble of figuring what part goes with what skull. I needed to tie the teeth bag to the skull. I keep adding to it throughout the season (up to 7 a week, as many as 3 on an excellent day). Dumping it about every week. End of season I dumped in a container of dollar store ammonia (this year upgraded to the hardware store variety). After about 3 months in the detergent and Oxy they are pretty white but a mix of Vol 40 with some old hair powder turned them to snow. They vary by what time they were processed. The skulls from last year I started to get some grease stains back on my beaver and otter skulls. Thinking maybe I should do the ammonia at full strength into a smaller container for a couple of days each and then glue the teeth back in? My existing year: I have a 5-gallon bucket of skulls that I need to shake to get them all covered with my solution which is a 64 oz ammonia with the water to cover them. About a dozen beaver / nutria / otter skulls from last year are done but starting to show some spotting. Do I put them one at a time to a smaller container a couple at a time and use 100% ammonia (or maybe just last years) I plan on using a small plastic Rubbermaid container and soaking each skull (two if they will fit), overnight in straight BO pulling them out and into very hot water. Should I switch to just clean water next year for the maceration? Would mop and glow keep the grease from raising to the top or is it just to make it look shinny?