if you use "synaptic" it's quite easy: (if you haven't then install it with "apt-get install synaptic")
Go to Sections > KDE-..., there you may choose the app that you want deleted with the right mouse button and then click to "apply" or something similar (I use it in german, therefore I don't know the exact term). And if synaptic tells you that it will remove kdebase then don't worry, 'cause kdebase is just a metapackage to choose all the good things KDE needs.
Debian Linux, mix of stable, testing and unstable; KDE with Compiz Fusion >=0.52 (git)