I handle it by being EXTREMELY organized with my mods. I have a bunch of folders and subfolders and everything is properly tagged with both the name of the thing AND the creator. Every piece of CC is accompanied by a picture so I know at first glance what it is. This way, it's very easy to figure out what's broken. In the case I still can't figure out what a piece of broken CC is, I put it on a sim/in an empty lot and I look at it with the Sims 4 Tray Importer. That program tells you what CC all sims/lots in your Tray folder have and allows you to open the folder it's in, so problem solved! ^^
