Heres the basic clean up (plus some setup)
sudo apt-get -y install gtkorphan logrotate localepurge fslint sudo apt-get autoremove sudo apt-get clean all sudo apt-get autoclean all sudo localepurge dpkg -l | grep '^rc'| cut -d' ' -f3 | xargs dpkg -P
When you take out packages the best way is to --purge or autoremove them
sudo apt-get --purge remove bluez-utils bluez-gnome sudo apt-get autoremove bluez-utils bluez-gnome
Then execute gtkorphan and keep killing unneed deps until it cant find any.
The Disk Usage Analyzer to sort out the biggest space wasters. Its found at Applications->Accessories->Disk Usage Analyzer.
There is also the computer janitor. Its at System > Administration > Computer Janitor.
And you can also hunt down the dead log files and other crap in you system with fslint.
You may need to loop around the whole process a few times to get it really clear
Several useless packages that tend to be installed by default are(sorry list is very short I got hacking before I thought about writing it down);