Hoppe’s Elite Foaming Bore Cleaner is a fast-acting spray-on foam that penetrates to remove carbon, lead, and most copper fouling from a gun bore. Created with hunters and recreational shooters in mind, this formula is ammonia free and low-odor. Simply spray the foam into the gun barrel and let the foaming agent break up fouling, then wipe the cleaner away. After the gun bore is clean, follow up with Hoppe’s Elite Gun Oil for additional rust and corrosion protection.