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Mod managers (NMM and MO) do that for you by either preserving the originals or by running in virtual Data folders so that the vanilla files don't get overwritten. I can't speak to FOMM as I haven't used it, but for NMM and MO, it's basically just clicking uninstall. How that affects your saved game is a different issue, but mod authors are pretty good about telling you how to keep from messing up your save.
Of course you can manually uninstall. Anything that was put in can be taken back out again. BUT (and it's a big one), if he overwrote vanilla files without making backups, then the modded sound/mesh/texture files remain, even if he deletes the .esp. If vanilla files were not overwritten, then it's just a matter of deleting whatever the mod added (read my first sentence).
delete the Fallout New Vegas Folder complete manuell
delete the folder FalloutNV in My Documents/My Games
Uninstall new vegas in steam.
Install New Vegas
Use a s-h-i-t manager in the future