After using a blank-firing gun you should always clean it in order to preserve its value and prevent rusting of the parts. But more importantly, regular cleaning, along with the application of a thin coat of lubricant, will help to keep it working well. A dirty gun can malfunction in an emergency and fail to reload, thus preventing effective self-defense. After shooting, first remove the magazine for safety. For a pistol, pull back the slide and make sure there is no cartridge in the chamber (for a revolver, swing out the cylinder). If you are able to strip the weapon (see instruction manual), remove the slide so that you have better access to the parts. If the barrel is obstructed by steel particles, it is best cleaned with inexpensive pipe cleaners. Also clean the breech face (which supports the head of the cartridge in firing), the surfaces in the ejection port and, where accessible, the hammer mechanism. Walther Gun Care Pro Expert oil, which was developed for blank-firing guns and other heavy duty weapons, is helpful if you make sure to apply only a thin coating. It is better as a spray. Unlike other agents, which often become gummy, it keeps unburned powder residues from sticking the next time the gun is fired and makes it easier to wipe them off.