Well yes, it's not particularly interesting, but after completing some deep, small hole boring recently, I suddenly became interested in swarf.
Because of the particular operation, I ended up with quite a lot of swarf down the spindle bore. Coat hangers, bits of rag, etc, worked to a point. Then the light bulb moment, what about a bottle brush? Bingo, a 40mm x 510 bottle brush from RS components. Cleans the spindle bore and chuck jaws perfectly.
Hope this is useful?