launder vs towel off

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. 

towel off

verb
  • To dry (oneself or another person or thing) completely, using a towel. 

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