Before and after the degreasing and whitening. I use acetone to degrease and it takes a while, but acetone can be reused until it turns a darker orange. Just remember to wear a face mask and work in a ventilated area while using it. Acetone also requires storage in a cool place, and can’t be poured down the drain to dispose of it. My township has a chemical recycling program, thankfully.
The other option for degreasing is keep the bones in heated, soapy water, but it has to be heated constantly. You can do this with a fish tank heater and a plastic tub, from what I can tell. I’ll look into that method at some point, if I ever have a place to work outside of the house (which isn’t looking good right now, but you never know.)
churchyardgrim 