cheesecloth vs cotton wool

cheesecloth

noun
  • A loosely woven cotton gauze, originally used to wrap cheese, but now used for various culinary tasks and by farmers to shade crops and keep birds off. 

cotton wool

noun
  • Raw fibers of cotton before being processed. 

  • Soft, absorbent cotton for medical or cosmetic use, protective padding, etc. 

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