Most people use polarizing filters to reduce the brightness of the sky so that it does not get blown out. However another very useful thing that polarizing filters do is that polarizers reduce unwanted reflections.
This shot below by forum member Travis is an AMAZING example of the same shot with and without a polarizing filter. The top image is shot without the polarizer and the bottom image uses the polarizing filter and gets rid of all the reflections. Thanks so much for letting me use these images Travis!
3 other links on our forum that talk about how to use polarizers
– Travis’s original post
– Neutral gradient filter — also talks about polarizers
– Filters — also talks about polarizing filters and other filters