Kleen-Bore GO5A: GUNK-OUT quickly evaporate and blasts away caked-on oil contaminated dirt, dust and powder residues. Solves most malfunction problems. KleenBores GUNK-OUT makes cleaning modern firearms easier and faster. Cleans fast and will not harm plastic, wood, laminates, composites, rubber grips or any other material including camo finishes. Use Oil after use of GUNK-OUT on all metal surfaces and metal to metal contact points, as GUNK-OUT removes all oil/grease from metal surface.