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I am no expert on polarized light or appropriate filters.  However, the basics are that if you have some elements of light that are polarized (such as possible from reflections), you can adjust the filter to reduce/eliminate that particular reflection.   Light from most sources is not polarized yet can become polarized through a variety of process (reflection is just one).

Sometimes it is just experimentation on how the filter is adjusted.   Here is a link that will explain the basics: http://www.physicsclassroom.com/class/light/Lesson-1/Polarization