how do i completely uninstall tor? (and then install it?)

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http://askubuntu.com – First of all, I'm really new to Ubuntu and Tor. I've been trying to get tor working for days now and I can't seem to do it. Right now I'm trying to remove all remnants of tor/vidalia/polipo from my computer so I can start fresh again. I've uninstalled vidalia and tor from the software center, but there's still two folders in the /etc directory (privoxy and polipo). Does this mean that these programs are still installed? If not, can I just delete the directory and how would I do that? I'm using Ubuntu 11.04. Thanks! (HowTos)