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"This category [science fiction] excludes rocket ships that make U-turns, serpent men of Neptune that lust after human maidens, and stories by authors who flunked their Boy Scout merit badge tests in descriptive astronomy."
- Robert Heinlein

UHF Shower  
  And ultra high frequency shower, which do used energy instead of water to wash off.  

Moving to the central fogon, he arranged some kindling and struck it to fire. He disrobed then tossing his Levi's and red and white flannel shirt into a hamper along with the rest of his clothing. Crossing to a tall, narrow stall, he entered and set the timer for a three minute UHF shower. Water was not a thing to be expended lightly in this region. When he merged, he drew on a buckskin shirt, khaki bush pants and a pair of soft moccasins.
From Eye of Cat, by Roger Zelazny.
Published by Pocket Books in 1982
Additional resources -

Compare to the refreshing chamber ('fresher) from Coventry by Robert Heinlein.

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