Usually means: Extremely clean, without any dirt.
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We found 8 dictionaries that define the word clean as a whistle:

General (6 matching dictionaries)
  1. clean as a whistle: Merriam-Webster
  2. clean as a whistle: Oxford Learner's Dictionaries
  3. (as) clean as a whistle: Cambridge Advanced Learner's Dictionary
  4. clean as a whistle: Wiktionary
  5. Whistle, Clean as a: The Word Detective
  6. clean as a whistle: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. clean as a whistle: Encyclopedia

Miscellaneous (1 matching dictionary)
  1. clean as a whistle: Idioms

Definitions from Wiktionary (clean as a whistle)

adjective:  (simile) Very clean
adjective:  (simile) Completely innocent; beyond moral reproach.

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