These are the only two chemicals you need to clean your firearm. Copperzilla is a great first step in gun cleaning. It breaks up and removes heavy lead, copper, and plastic fouling. Once all fouling has been removed from barrel, it is best to finish cleaning the entire gun with Gunzilla. Gunzilla is designed to finish cleaning, lubricate, and protect a weapon with one formula. Save over 10% when you buy this combo.