misinstruct vs soft-soap

misinstruct

verb
  • To instruct badly or wrongly. 

soft-soap

verb
  • To attempt to persuade by flattery or pleasing words; to butter up. 

noun
  • Persuasion by means of flattery or pleasing words. 

How often have the words misinstruct and soft-soap occurred in a corpus of books? (source: Google Ngram Viewer )