I have an old "Lyman Products" bullet removal hammer made by the Quinetics Corp. with a screw-on plastic hammer cap that is getting the threads all filled up with some sort of debris, so that the cap is hard to screw on. Of course, when it was new 30 years ago it probably screwed right on. But now I can't get it all the way tight to "hammer out" a bullet loaded in a cartridge. Anybody have any suggestions on something that will clean out this debris? I have tried scraping it out with a pick, but the stuff is real hard. Some flaked off though. Maybe some sort of solvent?