I use Eraser, which is free :

http://sourceforge.net/project/showf...ease_id=407684

If the link wraps, try http://tinyurl.com/qtcup

The link to the developer's page : http://www.heidi.ie/eraser/

Features: http://www.heidi.ie/eraser/features.php

You just need to figure out which files/directories to wipe.