How do i remove a pre exising customizer setting in wordpress theme

add_action( 'customize_register', 'ruth_sherman_theme_customize_register' );
function ruth_sherman_theme_customize_register( $wp_customize ) {

$wp_customize->remove_control('header_image');
$wp_customize->remove_panel('widgets');

$wp_customize->remove_section('colors');
$wp_customize->remove_section('background_image');
$wp_customize->remove_section('static_front_page');

}