Guy, what I have done to solve a similar problem with my 30/30 and 444 lever guns was to remove the bolt and put them in my Lyman® 2500 Turbo Sonic Cleaner. I set the timer for 8 minutes and ran it for a couple of cycles. Removed them, let them dry, and then degreased fully with Gun Scrubber™. I then lightly oiled with 3-in-One® oil. Problem solved.