Finally, that's what I was asking :laugh: . Ok, so I'm not an expert, but I believe there are some mods you shouldn't clean, some that don't matter, and some that you should clean (personally, to find out, first I check the mod description, looking for words like 'clean, tes5edit, dirty edits, ITM edits', then the comments section, then as a last resource just Google) Actually my last mod build got screwed up exactly because I began cleaning everything without checking... a while later I found out on a mod description page that the mod I had MUST NOT be cleaned, because the dirty edits were intentional. As a matter of fact I believe it even said cleaning it could be the cause of CTDs. So, my advice is don't always listen to LOOT... yeah it can be useful but although it fancies itself a "Big brother" for all mods, it sometimes is just dead wrong, for example: http://s13.postimg.org/wne1p368n/image.png This is what my LOOT tells me to do... BUT, if I deleted that .esp (even though I have USP installed) Belethor would stop selling me stuff right away. I know from playing experience that this fix works for me, and that beats any warning I could get. Also this isn't my only example, I have at least 2-3 similar cases in my current mod build. Hope that helps