Clean your clock??

I'm looking for the origin of the phrase "clean your clock". HELP!!

I haven't been able to find the origin of this one. Anyone have any ideas?

Two (speculative) ideas: the threat to hit someone in the face, since clockfaces have long been associated with human faces. Second, threatening a blow so violent it would blow the dust off the gears and inner mechanism of a clock, a veiled reference to shaking up the brain enough to scramble your senses. Pure guesswork.

To clock somebody: gauge speed using traditional navigational instruments, radar or gps sensors.

To clock somebody: punch their lights out while they aren't looking.