T17A(R) bore cleaner in a foaming agent. Effectively cleans and neutralizes the harmful fouling in the bore from black powder and black powder substitutes. The foam penetrates even the most caked on fouling and eliminates the need to brush your barrel. Simply spray into your barrel and let stand for one hour. The foaming agent does all of the work for you. Wipe your barrel clean and treat your barrel with T17A(R) Seasoning patches to prevent rust. Mfg: Thompson Center