You could try putting them in a pot of water and boiling them. After the lube melts out it will float to the top. Let the water cool and the lube will solidify on top and can be lifted off the water. I did this on a big batch of bullets I bought a a yard sale. They were covered in dust and grit. It worked well to remove the old lube. I relubed them and shot them in a 44 I had back then.
