Deexgnome on "Remove Toolbar for all user"

Hi there,

i would like to remove completely the Toolbar for all User and also Admins. I currently use a Plugin for that and would like to do this via Theme functions.

So i googled a bit arround and found some codes to disable it. But Sadly no one of it removed it.

Currently i tried

add_filter('show_admin_bar', '__return_false');
remove_action('wp_head', '_admin_bar_bump_cb');
show_admin_bar(false);