public function delete_method( $instance_id ) {
		global $wpdb;

		$method = $this->get_method( $instance_id );

		if ( ! $method ) {
			return;
		}

		delete_option( 'woocommerce_' . $method->method_id . '_' . $instance_id . '_settings' );

		$wpdb->delete( $wpdb->prefix . 'woocommerce_shipping_zone_methods', array( 'instance_id' => $instance_id ) );

		do_action( 'woocommerce_delete_shipping_zone_method', $instance_id );
	}