I tried to use the
gmenu-simple editor, but it said it can't find it. It's just for a good look.
A solution taken from the arch-wiki:
When doing a GNOME install, some unwanted icons might appear in the panel. To remove the icons, edit the GNOME panel script.
I am using this right now and it works with my gnome-shell!
.. one simple task -
Start Terminal and type in "sudo nautilus" ( without quotes )
Now, go to usr/share/applications/ ( click File System to see usr folder )..
You'll see a whole bunch of apps, whichever you don't want to see in the Gnome panel you drag it from there to another place ( whether it's desktop, folder etc.. do NOT remove it )..
Will work ;)