In article
<71505cf0-7c5d-4afb-a008-ab74f19e3a4f@d1g2000hsg.googlegroups.com>,

nik color efex pro has a polarizer effect, but it's not going to be the
same as using a real polarizer.  it basically darkens skies; it can't
do anything for reflections.

<http://www.outbackphoto.com/reviews/tools/20001115NikColorEfex.html>

You can't really do what polarize filter will do after the exposure.
The polarizing information is not captured by the camera so it is just too
late.

   There are some tricks to make something that sort of kind of maybe a
little like polarized after the fact, but in reality, it just can't be done.

A little off the subject of your question, but...

One thing I have always regretted was how I used a polarizer filter on
almost all of my outdoor pictures in my early days of photography back
in 1974.  Now I have a bunch of transparencies from that era that just
don't look even remotely natural.  I have done some correction in
Photoshop, but they still don't look normal.

Anymore, I rarely use a polarizer, and when I do, I take pictures both
with and without and with various rotations of the filter so I can pick
out the best later.

Gary