It is unlawful for any peddler, solicitor or canvasser in the course of his or her business to ring the doorbell or knock at any building whereon a sign bearing the words “No Peddlers, Solicitors or Canvassers” is exposed to public view. (Ord. 24 § 1, passed 5-12-1982. Code 1982 § 7-1-7. Code 2012 § 111.07.)