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"Beyond a thousand years from now humans are not quite recognizably human, and I have trouble finding characters."
- Larry Niven

Mechanical Cleaning Device  
  A small, ground-based autonomous robot doing basic janitorial work.  

This is a relatively early reference to this idea. The Roomba vacuum cleaner and the Scooba floor cleaning robot from iRobot are now ubiquitous and relatively inexpensive devices.


(Scooba in action)

Most of the Interior staff had gone home to bed; it was almost three in the morning, and the corridors and offices were deserted. A few mechanical cleaning devices crept here and there in the darkness.
From The Unreconstructed M, by Philip K. Dick.
Published by Science Fiction Stories in 1957
Additional resources -

Compare to the MSE-6 series repair and clean up droid, made famous in the original 1976 film Star Wars.

Also, fans of Ray Bradbury might be thinking of the robot mice from his 1950 novel The Martian Chronicles, while Heinlein fans might be thinking of the hired girl robot from his 1956 novel The Door into Summer.

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Additional resources:
  More Ideas and Technology from The Unreconstructed M
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to The Unreconstructed M
  Tech news articles related to works by Philip K. Dick

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