Hoppe's Foaming Bore Cleaner. 12oz. Can
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 necessary. Orange foam will turn blue indicating copper removal or black indicating powder removal.
One-step. No harsh scrubbing. Color Change Effectiveness Indicator. Hoppe's item# 908
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to – www.P65Warnings.ca.gov.