Any of you have any experience with Sea Lions or other marine mammal skulls? I got my female California Sea Lion skull from Skulls Unlimited and I've started cleaning it up. I started with a peroxide bath that whitened it up a lot, made the grease stains visible, and made the old collection data really fragile. I ended up scrubbing the data off, as I have paperwork and pictures of the skull before I started cleaning it so I wasn't too concerned about preserving the writing, but now I'm having issues with degreasing. After peroxide I let it soak in hot water to loosen up the glue so I could separate the mandible halves and remove most of the teeth. I managed to remove most of the teeth but some are still stuck in. My issues are that I have no idea how I should degrease. Its in a big pot of water and standard blue Dawn Ultra. The pot is in my incubator. I've never used metal pots for degreasing though so I'm worried the temps might get a big hotter than 115*F, which I usually degrease at. What do you guys think? Should I stick to blue Dawn? I was thinking of trying acetone but I don't want to spend over $100 on acetone if I don't have to. Let me know, I want to get this skull clean asap but I know degreasing isn't a quick process. I just want to choose the best option while still making sure I don't damage the skull as its over 60 years old.