dishrag vs scouring pad

dishrag

noun
  • A piece of cloth used for washing dishes. 

  • An unclean person; used in similes. 

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. 

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