A friend of mine from work mentioned that he used to own a gun shop in Texas before he moved to Idaho, and as luck would have it he had some leftover inventory. He said now that his FFL had expired, he couldn’t sell at a profit, but he let me have my pick of four Turkish Mausers at his cost. They were the ones selling for $90 about 5 years ago, so nothing impressive, but for the price I figured the Mauser 98 actions alone would be worth it. I picked up two this afternoon. They were in their shipping boxes and packed full of the nastiest grease I have ever seen. I think it was originally yellow, but most of it is black and crusty now. Once the outer layer is knocked off, the stuff underneath is sticky and WILL NOT COME OFF!! I scraped, wiped, sprayed with degreaser, washed with dish soap (got in trouble for that one) and all I managed to do is get one bore halfway cleaned. This is nasty stuff. I had to pound the cleaning rod through the bore as compressed air wouldn't blow the stuff out. When I did get the cleaning rod through I had a 29 inch long grease worm on the floor.
What can I use to get this stuff off?