xfce4 4.11, xubuntu 14.04, how to turn off session saving even HARDER

As kiosk mode also does not seem to work, create an upstart script:

start on (starting lightdm
          or starting kdm
          or starting xdm
          or starting lxdm)

description "kill XFCE sessions hard"
author  "Adamg"

task
normal exit 2

script 
 cd /home/username/.cache/sessions
 rm -rf *
 console output

end script

Replace username with yours. Enjoy a session free startup.