I think you're all wrong - the messiest tool is easily the plasterer's trowel.
Having just one room skimmed means that an entire house in covered in plaster dust, the garden is littered with debris and leftover bags & plaster, every bucket is full of muck, all the clothes in the house have pink dust embedded, all carpets are gritty, the driveway where the van parked has a halo of pink powder, every window is filthy - no matter how many precautions you take - even hermetically sealing off the room.