soft-soap vs woo

soft-soap

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

noun
  • Persuasion by means of flattery or pleasing words. 

woo

verb
  • (often of a man) To try to persuade (someone) to be in an amorous relationship with 

  • To endeavor to gain someone's support. 

  • To court solicitously; to invite with importunity. 

intj
  • Expressing joy or excitement; woohoo, yahoo. 

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