Skyrim fog mesh remover
Replaces the default "fog" meshes with blank ones.
Comparison screenshots, click for full size:

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Install:
Copy the downloaded meshes folder into the Skyrim Data folder. This is usually found in a place like "C:\Program Files\Bethesda Softworks\The Elder Scrolls V Skyrim".

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Uninstall:
Delete the following files from the Data\meshes\effects\ambient folder: