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Do a search in this forum for Light Pollution Filters and you wil find lots to read...
In a quick recap...
Are there filters that will work...yes...however, there is no filter that can substitute for a dark sky. In most cases I would suggest saving your money and investing in "better" eyepieces as I think most people will get more long term benefit from a good eyepiece instead of a filter.
I have an Astronomics Light Pollution Filter and it will block certain wavelengths of light (like those from streetlights)...and they do improve the views of some night sky objects (and detract from others).
I usually encourage people to get a UHC or NPB filter if they are so inclined instead of a Light Pollution Filter...a UHC/NPB will act like a Light Pollution Filter but even more so and therefore in my mind are a better value.
While a light pollution filter will help block unwanted wavelengths of light, they will not improve your eye's ability to dark sky adapt...I think this has more of a negative impact on viewing in town than many other things...
Do read the other threads when you get a chance and ask away...lastly, if you can "try before you buy" from some other Astro folks...
Clear Dark Skies...
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