Heard a great story once about a flight engineer who got fed up with the dust and crumbs being left on the consoles. He bought a length of plastic tube and would attach it to the smoke vent so he could use it as a hoover!
That's so old - we used all sorts of holes in the (unpressurised) Shack to hoover up rubbish, as taught to FE's and others from their predecessors on aircraft going back to before WWII.