abstergent vs cleansing

abstergent

adj

  • Cleansing, detergent. 

noun

  • A substance used to cleanse; a detergent. 

cleansing

adj

  • That cleanses. 

noun

  • The process of removing dirt, toxins etc. 

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