abluent vs abstergent

abluent

noun

  • A detergent. 

adj

  • Washing away; carrying off impurities; detergent. 

abstergent

noun

  • A substance used to cleanse; a detergent. 

adj

  • Cleansing, detergent. 

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