How to Hide SpeedyCache Admin Menus

function plt_hide_speedycache_menus() {
	//Hide "SpeedyCache".
	remove_menu_page('speedycache');
	//Hide "SpeedyCache → Settings".
	remove_submenu_page('speedycache', 'speedycache');
	//Hide "SpeedyCache → Manage Cache".
	remove_submenu_page('speedycache', 'speedycache-manage-cache');
	//Hide "SpeedyCache → CDN".
	remove_submenu_page('speedycache', 'speedycache-cdn');
	//Hide "SpeedyCache → Excludes".
	remove_submenu_page('speedycache', 'speedycache-exclude');
	//Hide "SpeedyCache → Object".
	remove_submenu_page('speedycache', 'speedycache-object');
	//Hide "SpeedyCache → Database".
	remove_submenu_page('speedycache', 'speedycache-db');
	//Hide "SpeedyCache → Bloat Remover".
	remove_submenu_page('speedycache', 'speedycache-bloat');
	//Hide "SpeedyCache → Test PageSpeed".
	remove_submenu_page('speedycache', 'speedycache-test');
	//Hide "SpeedyCache → Support".
	remove_submenu_page('speedycache', 'speedycache-support');
}

add_action('admin_menu', 'plt_hide_speedycache_menus', 11);

Where do I put this code?