Someone on the VCUK Facebook groups uses mealworms and they look like they are doing a really good job. I’ve never used them myself. Apparently they work great for anything larger than a jackdaw. Really small things like mice and shrews tend to get chewed up by them. They are a bit more rough on fragile bones than dermisteds.
Pillbugs/rolypolies will happily clean small skeletons for you, but they also might nibble on tiny bones.
Ants work for larger skeletons, but they’ll carry away smaller bones (squirrel toes) unless you confine the skeleton in mesh just large enough for ants to get through. They’re /fast/, too. Good for larger things like skulls. Best to use a wild batch of ants and put the skeleton near them rather than trying to keep ants in your house, though.