detergent vs suds

detergent

noun
  • Any non-soap cleaning agent, especially a synthetic surfactant. 

adj
  • Synonym of cleansing. 

suds

noun
  • Lather; foam or froth formed by mixing soap and water. 

  • Beer. 

verb
  • To cover with, or as if with, soapsuds. 

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