MDT NanoGuard Gun Cleaner - 13.5 US FL OZ Spray Can MDT Nanoguard Gun Cleaner is step one in a three-part system designed to keep your firearm running like new. Originally developed for industrial wire rope maintenance in harsh environments, Nanoguard's high-performance chemistry was adapted for firearms by combining cleaning power with nanotechnology. This cleaner strips away carbon, oil, and grime with precision, giving your rifle the clean slate it needs for long-term protection and lubrication.