I had noticed reading through some forums that some people were using polarized filters with their weather camera. I noticed right away on my weather camera that the image seemed washed out. So, I decided to research a polarized filter.
The first option I found was a sheet of polarized film. This seemed like a good solution except for the price.
I settled on a standard 35mm filter. I was able to position it right in front of the web camera and the window glass.
The pictures did start to show more contrast which was nice.