Code Blue® D/Code? Scent Elimination Field Spray incorporates Dual Action technology to minimize both human odor caused by bacteria and other offensive foreign odors, such as dogs, food, vehicle exhaust, campfire and tobacco smoke. D/Code consists of natural ingredients and medical grade, patented silver for superior performance. Spray Code Blue D/Code Scent Elimination Field Spray generously directly on caps, boots, clothing and gear. For best results, reapply before each hunt.