Include xhost + at auto reboot script

Below is the startup/stop script for vncservers by end-user.
How can xhost + command include in this script?

Please help. Thank you.

#!/bin/sh
#
# Startup/Stop script for vncservers for some users.
#

case "$1" in

'start')
/bin/rm /tmp/.X11-unix/X0
/bin/su - applprod -c "/export/home/applprod/VNC/vncserver :0"
;;

'stop')
/bin/su - applprod -c "/export/home/applprod/VNC/vncserver -kill :0"
;;

*)
echo "Usage: /etc/init.d/rc.vnc { start | stop }"
;;

esac