Removing glare from water and reflections from glass etc. are pretty much the work side of polarizers. A little experimentation will show you what you can and can’t do. (Hint: sun angle vs. camera angle is important here. Try shooting outside in the sun on a clear day with a medium sun angle (let’s say 10am) Set the polarizer to get the sky as clean as possible and then slowly pan 360 degrees. Watch what happens to that sky as the relationship between the lens and the position of the sun changes.) Water and air (read sky) both scatter a lot of light (back to physics class, that’s why they appear blue.) Besides removing glare, a polarizer can dramatically deepen that blue. You can go over the top here but look at any travel brochure and you will realize that you have never actually seen a sky that looks like the one in the pictures. I personally like the effect but that taste is not universal. Not a polarizer issue, but if you are working outdoors the time of day you shoot is important as well. They don’t call it “magic hour” (dawn & dusk) for nothing.
New to Cow but not to TV