Back in 1903, chemist Frank A. Hoppe combined nine chemicals and came up with what has to be the most famous, most nostalgic, most recognizable and best-smelling bore solvent ever created. Hoppe's No. 9 - the name even has a pleasant ring to it. Originally called Hoppe's Nitro Powder Solvent No. 9, the aromatic elixar removed the residue left behind by that newfangled stuff called smokeless powder, and if left in the bore long enough, would eventually dissolve copper fouling left in the bore by those equally new jacketed bullets. Over a hundred years later it still is an excellent bore solvent.