abstergent vs washing-up liquid

abstergent

noun
  • A substance used to cleanse; a detergent. 

adj
  • Cleansing, detergent. 

washing-up liquid

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

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