Thompson/Center®’s Number 13® Bore Cleaner is the industry standard for muzzleloader cleaning and has been the trusted bore cleaner for years. It features an all-natural formula which contains no petroleum based additives and is compatible with the Natural Lube 1000 Plus™ Bore Butter. It quickly and easily removes all residue and powder fouling in barrels making the task of cleaning a muzzleloader a lot more enjoyable.