Sometimes, a greyish fog gets stuck around the player, and that's a pain in the ass.
HOW TO USE:
1. Download this mod.
2. Open Skyrim.
3. Go to third person.
4.Open the console.
5.type "bat wispfix1" in the console.
6. Close the console again.
7.Open it again.
8. Type "bat wispfix2" and it's fixed :D

I think this started happening for me after I installed "Interesting NPCs," and when I went to Dragonsreach Dungeon, because it adds a wispmother in there, the fog appeared.

Some files from this mod is from a forum post by steve40. Credit goes to him.

The forum post: http://forums.nexusmods.com/index.php?/topic/872861-tutorial-removing-unwanted-magic-effects-from-the-player/