http://www.youtube.com/watch?v=fw3g_N1jcZQ
BEFORE RUNNING THE TES5EDIT WATCH THIS MOVIE FIRST!!!

EXAMPLE:
After running BOSS a message like this can appear:
Skyrim.esm Active
Update.esm Active
Bash Tag suggestion(s): {{BASH: Delev, Relev}}
Contains dirty edits: 92 ITM, 3 UDR records. Needs TES5Edit cleaning. A cleaning guide is available here.
Dawnguard.esm Active
Contains dirty edits: 619 ITM, 82 UDR records. Needs TES5Edit cleaning. A cleaning guide is available here.
Bash Tag suggestion(s): {{BASH: Delev, Relev}}
HearthFires.esm Active
Contains dirty edits: 184 ITM, 11 UDR records. Needs TES5Edit cleaning. A cleaning guide is available here.
Dragonborn.esm Active
Contains dirty edits: 61 ITM, 8 UDR records. Needs TES5Edit cleaning. A cleaning guide

1. Run TES5Edit and check Update.esm, wait for it to say 'Background Loader: finished'
2. Right-click on Update.esm and press 'Apply Filter for Cleaning', wait for it to say '[Filtering done]'
3. Right-click on Update.esm and press 'Remove "Identical to Master" records'
4. Right-click on Update.esm and press 'Undelete and Disable References'
5. Exit and save, backup if you want.

Do the same for Dawnguard.esm, HearthFire.esm and Dragonborn.esm

That's it

required files:

TES5EDIT
http://www.nexusmods.com/skyrim/mods/25859/?

BOSS
http://www.nexusmods.com/skyrim/mods/6/?