uphold vs wipe slate clean

uphold

verb
  • To keep erect; to support; to sustain; to keep from falling 

  • To hold up; to lift on high; to elevate. 

  • To support by approval or encouragement, to confirm (something which has been questioned) 

wipe slate clean

How often have the words uphold and wipe slate clean occurred in a corpus of books? (source: Google Ngram Viewer )