Patch-Out is Wipe-Out Bore Foam in a non-foaming liquid concentrate. It removes copper fouling even faster and more effectively because it is concentrated. Wipe-Out™ Bore Foam is Famous for its ability to safely dissolve copper fouling from your rifle barrel with a brushless foaming application method. It works SO well but can take an hour or more to do its work. Patch-Out is a straight copper solvent with no foaming agent... It is undiluted concentrate and works faster! See our Wipe-Out Page!