As suggested earlier you may uninstall BE from Add remove programs.
There is no clean up utility within BE. You may search for Windows cleanup utility on google.
Below is the link which explain manuall uninstallation but its for BE12.5 and below versions.
However most of the things are same throughout all versions of BE so you may give a try
As others have said, Symantec does not provide a programatic method to uninstall BE2012 from a server like SEP Clean Wipe.
Since the challenges of BE2012 have begun, we have done a complete reinstall of BE2012 many times, we believe that the easiest and fastest way is to reformat the system and reinstall Windows Server 2008 R2 and then BE2012...
Not only is this method easy and fast (the older versions of Windows Server take a bit longer), but you know when you finish that there is NOTHING left over from the previous install that can mess with your new system.
YMMV, but a complete bare-metal install works well for us.