Is it possible to somehow to clean N9 (do factory reset) without touching the screen?

To problem is, that touchscreen on my N9 stopped responding completely. Before letting the phone out of my hands, I'd like to reset it to factory settings, or at least clean all my passwords. Is it possible?

I have working ssh access and I have some linux knowledge, so I can do some basic things like deleting files or installing packages. I also tried connecting using VNC, but I can't control the phone from my pc. I successfully started x11vnc on the phone, I connected using TightVNC and VNC Viewer from RealVNC, I can see the screen in both of them (and when I wake up phone using phone button, lock screen is shown on my pc), but I can't control the phone, it is completely unresponsive to all mouse and keyboad inputs I tried. I don't know, if it is problem with the VNC server or client.

Thanks in advance for any help.