public static function clear(Member $member, $alcDevice = null)
    {
        if (!$member->exists()) {
            return;
        }
        $filter = array('MemberID'=>$member->ID);
        if (!static::config()->logout_across_devices && $alcDevice) {
            $filter['DeviceID'] = $alcDevice;
        }
        RememberLoginHash::get()
            ->filter($filter)
            ->removeAll();
    }