Remove admin menu not working!

I wanna remove the admin menu which are generated by installed plugins. I have tried with these code but this is not work!
remove_menu_page( ‘admin.php?page=bws_plugins’ );//it’s not work

function remove_admin_menu_items()
{
remove_menu_page( ‘edit.php?post_type=mtbxr_metabox’ );//it’s work
remove_menu_page( ‘admin.php?page=bws_plugins’ );//it’s not work
}
add_action(‘admin_menu’, ‘remove_admin_menu_items’,999);