launder vs scrub up

launder

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

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

noun
  • A gutter (for rainwater). 

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

  • 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. 

scrub up

verb
  • To clean or wash by scrubbing. 

  • To dress up. 

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