........................
That is extremely difficult, as far as being completely thorough.
To butcher it as best as you can without much extra searching and destroying...
Wax the following:
(including all subdirs)
/usr/local/cpanel
/var/cpanel
/scripts
/home/cpanel
And.... get rid of anything pertinent to cpanel within the root cron, and anything within /etc/rc.d/rc.local that is CPanel in nature.
Then your box is 99% clear, I\'d say. I didn\'t touch any of the config files/settings for many of the 3rd party daemons/services that are stored elsewhere that CPanel might have *tweaked* mind you.
Peace.
