cleanup vs cover story

cleanup

noun
  • The act of cleaning or tidying something. 

  • Fourth in the batting order; a cleanup hitter. 

cover story

noun
  • A fictitious account that is intended to hide one's real motive. 

  • A story included in a publication that is highlighted on the front cover. 

How often have the words cleanup and cover story occurred in a corpus of books? (source: Google Ngram Viewer )