abstergent vs dry cleaner

abstergent

noun
  • A substance used to cleanse; a detergent. 

adj
  • Cleansing, detergent. 

dry cleaner

noun
  • A person whose business is the dry cleaning of clothes and other fabrics. 

  • A business establishment that engages in the dry cleaning of clothes and other fabrics. 

How often have the words abstergent and dry cleaner occurred in a corpus of books? (source: Google Ngram Viewer )