I've had a lot of luck letting the flesh rot off. Definitely not a pleasant experience (I wouldn't be able to do it this way if I didn't have an old chicken coop so it's isolated smell and scavenger wise) but the bones turn out beautifully with a rinse and a light peroxide wash. Again, not pleasant, but after the carcass or limb has been sitting in a bucket of water for 2-3 months it's a piece of cake