clean as a whistle vs lily-white

clean as a whistle

adj
  • Completely innocent; beyond moral reproach. 

  • Very clean 

lily-white

adj
  • Innocent, having a reputation beyond reproach. 

  • Pure, unblemished, immaculate. 

  • Of the Caucasian race; white. 

  • A shade of the color white. 

How often have the words clean as a whistle and lily-white occurred in a corpus of books? (source: Google Ngram Viewer )