dish liquid vs washing-up liquid

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. 

washing-up liquid

noun
  • A form of liquid soap used to wash dishes by hand. 

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