Start by ignoring all of the advice posted here: Resetting Xfce Panels to default settings?
Then you can do this:
#!/usr/bin/env bash
while read channel
do
for property in $(xfconf-query -l -c $channel)
do
xfconf-query -c $channel -r -p $property
done
done < channels.txt
...
$ cat channels.txt
displays
ristretto
thunar
xfce4-desktop
xfce4-keyboard-shortcuts
xfce4-notifyd
xfce4-panel
xfce4-power-manager
xfce4-session
xfce4-settings-editor
xfce4-settings-manager
xfwm4
xsettings
Why is this a question? I don't have Stack Exchange points needed to reply to the actual thread.
Somebody please do the needful.