Yes, A.P.I. Firearm Storage Bags are most effective when a thoroughly cleaned firearm is stored inside. Firearms should always be cleaned per the manufacturer’s specifications before being placed inside the storage bag for short or long-term storage. Cleaning the firearm while in storage is not necessary unless the firearm is removed from the bag and used. Once a correctly stored firearm is removed from the A.P.I. Firearm Storage Bag, the VCI molecules dissipate from the metal surface leaving behind no messy residues and allowing the firearm to be used directly out of the bag.