True Blue hun Cleaner is another performance based product for the use of cleaning all guns, firearms and knives. Just as all of our other products lines, True Blue Gun Cleaner was developed to be aggressive, efficient and high performance, yet safe on all parts of a firearm and knife. Breaks down oils, greases and carbon build up. It leaves no residue. Once cleaned use our Gun Oil and/or Gun Grease to prevent corrosion while giving high performance.