townies are taking over!

I may have to abandon this neighborhood and start over because my game is full of townies. I found the hacks from MoreAwesomeThanYou that stop townies from being respawned, but I think it might be too late for my neighborhood. Right now I'm at 735 characters, and my hard drive is getting more and more crowded every day. Does anyone have any suggestions? Is there an easy way to permanently delete the townies?