Just using gun oil and brush for simple cleaning seemed to be ineffective. Although the gun oil could remove the gunpowder residue produced after shooting and some other difficult-to-remove dirt, it did not seem to work well for microscopic dust that was nearly invisible to the naked eye.
Moreover, Gao Yi had brought only a small bottle of gun oil, and it was impossible for him to give his beloved gun a thorough and deep cleaning.
Moreover, simple gun cleaning Gao Yi could handle, but he was not skilled in deep maintenance.
However, there was a very good candidate here, Donkey.
Donkey might not be a gunsmith, but he definitely had a deep understanding of guns, so Gao Yi did not intend to be polite with Donkey.
"Hey, Donkey, can you come and help me with something?"
Gao Yi called Donkey with a walkie-talkie, and Donkey did not make Gao Yi wait long; he soon arrived in Gao Yi's room.
As he entered Gao Yi's door, Donkey politely asked, "What do you need?"