how can I delete CakePHP's session cookie?

core.php - at Session Cookie setting line
=====================================
Configure::write('Session.cookie', 'Cakephp');
=====================================

I want to delete this cookie when user logout but I don't know how to
delete this cookie

I tried
$this->Cookie->del('Cakephp');
$this->Cookie->destroy();

but it's not working at all.

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