clean as a hound's tooth vs immaculate

clean as a hound's tooth

adj
  • Very clean; very innocent. 

immaculate

adj
  • morally pure, free from sin. 

  • absolutely tidy, having no blemish or stain. 

  • (botany) Lacking blotches, spots, or other markings. 

  • containing no mistakes. 

How often have the words clean as a hound's tooth and immaculate occurred in a corpus of books? (source: Google Ngram Viewer )