I tossed my clean templates on my most recent EP installation and haven't felt much like finding and putting them all back in).
You don't need clean templates if you're going to create a completely clean hood, only if you want a clean maxis hood. You just need to delete (back up!) the character files in the game folders.
Start with all the files in ***\EA GAMES\The Sims 2\TSData\Res\NeighborhoodTemplate\N001\Characters\ them move from EP to EP to remove any new (sub)hood characters.