pot scrubber vs scouring pad

pot scrubber

noun
  • A mesh or ball of wires or fibres used to scrub pots and other cookware. 

scouring pad

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

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

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