bath sponge vs washrag

bath sponge

noun
  • A sponge, made from any material, that is used for cleaning the body while bathing. 

  • A commercially used species of sponge (porifer, invertebrate of the phylum Porifera) found throughout the Mediterranean Sea, Spongia officinalis. 

washrag

noun
  • A square piece of cloth for washing the face and body. 

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