dirty washing vs laundry

dirty washing

noun
  • synonym of dirty laundry 

laundry

noun
  • A laundering; a washing. 

  • A penalty flag. 

  • That which needs to be, is being, or has been laundered. 

  • A place or room where laundering is done - including, by extension, other forms of laundering than clothes washing. 

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