bagwash vs dirty laundry

bagwash

noun
  • A type of laundry in which the washing was returned to the customer in a bag, undried and unpressed. 

dirty laundry

noun
  • A clothes hamper or other container in which soiled laundry is placed. 

  • Used other than figuratively or idiomatically: see dirty, laundry. 

  • Unflattering or embarrassing facts, or questionable activities that one wants to remain secret, but which someone else may use as blackmail. 

How often have the words bagwash and dirty laundry occurred in a corpus of books? (source: Google Ngram Viewer )