Windshield & Window Rattling

Hey,
I'm trying to figure out how to get rid of "dirt" that seems to be trapped in my windshield. Whenever I'm driving and there's a bright light ahead of me (i.e. the sun glaring into the windshield), I become pretty much blinded. All I see is some weird spots on the windshield...I hesitate to use the word "warp" but there's these dirt stains in the windshield. I tried washing the windshield from the outside and wiping it a bit from the inside with just a tissue, but it doesn't clean the windshield 100%. I still see a lot of these stains. I've seen this issue in other cars too so it's probably a cleaning problem.
Are there any products that I could use to get rid of this? I tried using my point & shoot to take a pic but it doesn't show up in the pic :(
Also, my window rattles a lot when it's partially open and I encounter small bumps in the road or am on the highway driving at high speeds (80km/hr+). Any way to tighten up the window so it doesn't shake while driving?