§ 111.27 SIGNS TO BE OBEYED.
   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.
(`87 Code, § 8-1-7) Penalty, see § 10.99