A polish (such as a wax) called "French polish" does not exist.

"French polishing" is a technique for applying shellac finish to
a wood surface, with lots of buffing and rubbing.  A search on the
Internet yields lots of adverts and some description, but nothing
about the origin of this term.  Some quotes from web pages:

 "French polishing is one of the classic finishes for wood.
  Although French polishing came to the fore in the late 19th century,
  the underlying premise of using shellac has been used for nearly
  4000 years."  (http://www.am-wood.com/finishes/french.html)

 "French Polishing is a hand buffing process used to repair certain
  finish imperfections and revitalize dull finishes.  It is especially
  applicable to antiques. Pricing is $17.50 per square foot of area
  to be polished."  (http://www.medicbykp.com/)

Robbie Rhodes