CVA Slick Load Barrel Blaster Solvent For Muzzleloading Rifles 4 Ounces Dissolves residue left from shooting blackpowder or pyrodex. Also recommended for removing mercuric primer resider. Use frequently when firing to prevent loss of accuracy. Water soluble - safe for use with natural and biodegradable patch and bullet lubricants. Handy flip-top spout for no spill cleaning. Biodegradable