clean as a hound's tooth

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(as) clean as a hound's tooth (not comparable)

1. (simile) Very clean; very innocent.
   • 1983, James C. H. Shen, “A Round of Calls”, in Robert Myers, editor, The U.S. & Free China: How the U.S. Sold Out Its Ally‎, Washington, D.C.: Acropolis Books Ltd., →ISBN, →LCCN, →OCLC, page 105:

     Rogers left the Department of State in September, 1973, before the Watergate scandal had implicated Nixon and some of his principal White House aides. He couldn't have picked a better time to return to private life and all his friends were happy for him. Bill Rogers simply cleaned his desk and moved back to his old law firm, Rogers and Wells. He came through all this untarnished, as clean as a hound's tooth.

• clean as a new penny
• clean as a whistle