Description IOSSO Bore Cleaner removes copper, lead, carbon burn, powder fouling, plastic wad residue, and surface rust. It is non-corrosive, non-flammable and has no offensive odors or mists. NEW BIO-Based Formula. Directions It is recommended to first apply a gun cleaner (such a Gunsmithy Traditional Gun Cleaner or Schutze CLP) on a patch and run it through the bore. Next, apply Isso Bore Cleaner sparingly to a brush. Run through the bore 8 to 10 times then follow with clean dry patches until one remains clean. Repeat if necessary. It is normal on repeat cleanings for the first few patches to contain black residue. Lastly, moisten a patch with the gun cleaner and run through the bore for a final finish. __________________________________________________________________________________________________________________________________________________________________