Use Hoppe's Foaming Bore Cleaner to dissolve and remove copper and powder residue quickly and effortlessly. The easy dispense tube makes it easy to dispense into the bore and the superior cleaning formula does the work for you so no brushing of the bore is necessary. The orange foam also includes a color change effectiveness indicator and will turn blue indicating copper removal or black indicating powder removal. That way you always know when it's working.One-stepNo harsh scrubbingColor change effectiveness indicatorCleans copper and powder from boreIncludes easy dispense tube