Yep, that's all it took. I'm pretty sure that Gopher went over why those edit's should be cleaned. But to rehash: ITM = Identical to master. That means that there is an actual edit in the file that is identical to it's master file. Usually the master file is Skyrim.esm. A mod that has ITM can potentially cause trouble for any mod that loads before it. For instance, you might have a mod that changes the damage of a weapon but you also have a mod that has an ITM for that same weapon in it. In this case your mod that changes that weapons damage won't work! The mod with the dirty edit, the ITM, will prevent those changes from taking effect. UDR = References that have been deleted. These are very bad because a mod that loads after a mod that has a UDR for the reference that mod edits will cause the game to crash. This happens because the game thinks that the item no longer exists, but it has a mod telling it that the item does exist. There may be more to this than I've explained here, but these are always bad. There is no good reason to ever have them in your file. Edit: if you went through and did what Gopher said, you are done. If you want you can do it again, it won't hurt. If you did it right you will notice in the message log that this time TES5Edit removed 0 files instead of however many it removed before. Also, it won't prompt you to save. Dirty edits do go a little deeper than this, but that info is reserved for mod authors for the most part, as the mod user is unlikely to know the difference between a wild edit and an intentional one. Don't worry about that last part if it confuses you, lol.