Remove the themes, icons, and sounds

rm -rf ~/.themes
rm -rf ~/.icons
rm -rf ~/local/share/sounds

Reset the xfconf sound theme property (if sounds were installed)

xfconf-query -c xsettings -p /Net/SoundThemeName -r

xfconf

  • xfconf is XFCE’s hierarchical configuration manager
  • xfconf-query allows you to modify the config settings stored in xfconf
    • -c switch specifies the channel to query/modify, which is xsettings here
    • -p specifies the property in that channel to modify, which is /Net/SoundThemeName
    • -r resets the property

Start Settings Editor xsettings Net/ SoundThemeName

If the GTK3 override has been done too, then run this

rm ~/.config/gtk-3.0/gtk.css

This remove the gtk.css file, thus resetting style

Remove the GTK overlay scrollbars .xsessionrc override with this command

rm ~/.xsessionrc

Remove the Chicago95 terminal color scheme with this

rm ~/.local/share/xfce4/terminal/colorschemes/Chicago95.theme

That should remove all the Chicago95 stuff. Reset XFCE settings to defaults after that