RAM Nitro-Solvent in a 100 ml bottle, a bore cleaning solvent for firearms. As the name says, it is meant for removing the residue that nitro (smokeless) powder leaves in the barrel after shooting, along with general fouling. Apply it to a cleaning patch or bore brush on a cleaning rod, run it through the barrel and leave it to work for a few minutes, then brush and push dry patches through until they come out clean. Finish with a light coat of gun oil to protect the steel against rust. Work in a ventilated place, keep the bottle closed and out of reach of children, and follow the directions on the label.