When you need to mechanically clean a hole or the inside of a pipe, a homemade brush is very useful. To make such a nozzle for a drill is quite simple in a garage, you will need a bolt with nuts and a cable of the desired diameter. If the cable is thicker than necessary, it can be dissolved to the desired size.
This design is still convenient because, unlike the store ones, it can be repaired by replacing the worn parts of the steel wire.