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"People ask me how I do research for my science fiction. The answer is, I never do any research. I just enjoy reading the stuff, and some of it sticks in my mind and fits into the stories."
- Frederik Pohl

Window-Cleaner Robots  
  Robots that perform the task of cleaning and polishing transparent surfaces.  

The cylindrical ship Rama had enormous lighting strips; how to keep them clean?

There were the "window cleaners," with large padded feet, who were apparently polishing their way the whole length of Rama's six artificial suns. Their enormous shadows, cast right across the diameter of the world, sometimes caused temporary eclipses on the far side.
Technovelgy from Rendezvous With Rama, by Arthur C. Clarke.
Published by Harcourt Brace Jovanovich in 1972
Additional resources -

The Window Cleaner robots are really "biots", biological robots that have stored energy cells like electric eels.

Compare to Window Willie from Door Into Summer (1956) by Robert Heinlein.

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Additional resources:
  More Ideas and Technology from Rendezvous With Rama
  More Ideas and Technology by Arthur C. Clarke
  Tech news articles related to Rendezvous With Rama
  Tech news articles related to works by Arthur C. Clarke

Window-Cleaner Robots-related news articles:
  - Winbot Scrubs Your Windows
  - Ecovacs Winbot 7 Window-Cleaning Robot
  - SINTEF Robot Cleans Solar Panels
  - BladeBUG Robots Clean Massive Wind Turbine Blades
  - Solar Powered Robot Cleans Up Solar Panels For Free
  - Solar Panel Cleaning Robots

Articles related to Robotics
Golf Ball Test Robot Wears Them Out
PaXini Supersensitive Robot Fingers
Artificial Skin For Robots Is Coming Right Along
Robot Guard Dog On Duty

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