What should you use to clean the outside surface of a firearm?

Using a lightly oiled rag to clean the outside surface of a firearm is the recommended practice for several reasons. First, a lightly oiled rag provides a protective layer that can help prevent rust and corrosion, which are critical concerns for maintaining the integrity of a firearm. Oil creates a barrier against moisture and the elements, which is important for preserving any metal components of the gun.

Additionally, the oil on the rag can aid in lifting off dirt, fingerprints, and other contaminants without being abrasive. This method is gentle enough to protect the finish of the firearm while still being effective in cleaning.

In contrast, a dry cloth may not effectively remove stubborn residues or provide that necessary protective layer. A solvent-soaked sponge can be too harsh and may strip away oils or finishes, potentially damaging the firearm. Lastly, using any household cleaner can introduce unknown chemicals that might harm the firearm's materials, leading to corrosion or deterioration. Therefore, using a lightly oiled rag is the most appropriate choice for cleaning the exterior of a firearm.