dish liquid vs dishwasher

dish liquid

noun
  • A type of liquid soap intended to help people clean dirty dishes with their hands, as compared with dish detergent which is used in dishwashers. 

dishwasher

noun
  • A machine for washing dishes. 

  • A European bird, the wagtail. 

  • Someone who washes dishes, especially one hired to wash dishes in a restaurant. 

  • A bird, the restless flycatcher (Myiagra inquieta). 

How often have the words dish liquid and dishwasher occurred in a corpus of books? (source: Google Ngram Viewer )