Quickly and effortlessly dissolves and removes copper and powder residue. Its superior cleaning formula does the work for you no brushing or other mechanical cleaning necessaryFeatures: One-Step No Harsh Scrubbing Color Change Effectiveness Indicator Directions: Allow barrel to cool 5 minutes before use. Shake can well. 1. Spray foam from chamber to muzzle 2. Wait 15-30 minutes for foam to clean. 3. Using a Hoppe's cleaning rod and patch remove foam from barrel. Note: Foam will turn blue indicating copper removal or black indicating powder removal.