The Thor Muzzleloader Cleaning Solvent is a non-toxic and non-hazardous, rust preventive solvent specifically formulated for black powder firearms that is both water soluble and bio-degradable. To use, simply soak a dry cotton patch in Thor Solvent, and run it through the muzzleloader barrel to dissolve residue left from shooting black powder or pyrodex. Use a brass or nylon cleaning brush to remove any large chunks impediments. Next, swab the barrel alternating a soaked patch and a dry patch until the patches come out clean. It’s that simple. The Thor Solvent is a great way to clean with little effort! The solvent does all the work for you, and makes cleaning your rifle’s barrel both simple and efficient.