There are various methods for cleaning gas nozzles when spatter does end up collecting in them. Remove the gas nozzle to inspect it. A spatter-full or damaged nozzle has to be wire brushed with a hand drill or lathe with a wire wheel brush. Thorough cleaning would include brushing the outside and inside flat surfaces, brushing the edges, and brushing out the threads. Once cleaned, a gas nozzle should be free of surface inconsistencies, and the threads should be clean enough to allow the copper nozzle to be threaded back onto the chrome water-cooled nozzle by hand. It is important to remember that after cleaning out the nozzle, blow it out with air to remove any metallic or foreign particles that might prevent a clean thread connection.