I have tried using gnome 3.8 (see http://www.omgubuntu.co.uk/2013/04/gnome-3-8-ppa-for-ubuntu-gnome) I did't like it, so I want to switch back to Unity.
I did the uninstall instructions described on the page, but still I have a part of Gnome. The bar on top is still black with icons from Gnome. Also Google Chrome, Firefox etc has the look and feel from Gnome rather then Unity. Minimize, maximize and close icons are different. So I think it is not removed/disabled completely, how can I revert back to Unity completely?