Expanding foam formula fills the bore to attack copper and powder fouling without harsh scrubbing. Contact with copper turns the foam blue, so you can easily see when the copper is removed. Non-corrosive, contains no ammonia, and not harmful to skin. Convenient spray tube directs foam directly into the bore with no overspray.
SPECS: Aerosol foam, 3 oz. (85g), 5 oz. (142g), or 12 oz. (340g) can.
Catalog page 311