scouring pad vs steel wool

scouring pad

noun
  • A flat piece of a rough fabric used for cleaning purposes. 

  • A pad, having a soft, sponge-like side and a more abrasive side, used to wash up. 

steel wool

noun
  • fine strips or threads of steel, usually formed into pads or balls and used as an abrasive. 

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