dirty washing vs washbasin

dirty washing

noun
  • synonym of dirty laundry 

washbasin

noun
  • A laundry sink. 

  • A basin used for washing, (now) particularly a permanently installed sink, fitted with a water supply and a drain, for washing the hands and face. 

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