scratch out vs scrub up

scratch out

verb
  • To remove something by scratching. 

  • To remove something which was written, by erasing or by putting a mark through it. 

scrub up

verb
  • To clean or wash by scrubbing. 

  • To dress up. 

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