rub off vs scrub up

rub off

verb
  • To clean by rubbing. 

  • To be transferred with little or no effort. 

  • Used other than figuratively or idiomatically: see rub, off. 

scrub up

verb
  • To clean or wash by scrubbing. 

  • To dress up. 

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