launder vs sugar soap

launder

noun
  • A trough or channel carrying water to the wheel of a watermill. 

  • A gutter (for rainwater). 

  • A trough used by miners to receive powdered ore from the box where it is beaten, or for carrying water to the stamps, or other apparatus for comminuting (sorting) the ore. 

verb
  • To disguise the source of (ill-gotten wealth) by various means. 

  • To wash; to wash, and to smooth with a flatiron or mangle; to wash and iron. 

sugar soap

noun
  • An extremely powerful detergent used for washing surfaces prior to painting. 

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