I'm macerating various skulls and a fox skeleton at 84 F in Ziplock bags in a 5 gallon bucket and had a few questions. 1) The bear skull is very yellow with grease after I changed the water at week 2. Still more meat needs to break down. How often should I change the water? 2) Beaver teeth: The beaver head is in a little baggie. The water was red with blood when I refreshed it. Only the teeth were stained black. Is that because of the bag? Will peroxide get the teeth back to orange? SHould I use a bigger bag? 3) Am I making degreasing harder by keeping the skulls in bags? I don't want to have to fish around for teeth and little bones Vultures came around the next day because they smelled the fleshy bits I poured off.