To uninstall task-polish-desktop just follow these instructions.
/debian/wheezy/main///install/index.html Polish desktop Debian 7.0 tasks 3.14.1
sudo apt-get remove task-polish-desktop
Which will remove just the task-polish-desktop package itself.
sudo apt-get remove --auto-remove task-polish-desktop
This will remove the task-polish-desktop package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for task-polish-desktop then this will work.
sudo apt-get purge task-polish-desktop
Or similarly, like this task-polish-desktop
sudo apt-get purge --auto-remove task-polish-desktop
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