Cookies not deleting?

I was running into a problem where i was setting two different cookies
for "
www.myapp.com" and “myapp.com”. To fix this, when i set the cookie i
specified the domain to be “.myapp.com”. However now when i try to
delete
the cookie cookies.delete :myapp_cookie, it wont delete.

Why is that?

Here is my code:

when logging in -

cookies[:myapp_cookie] = {:value => logged_in_user.get_remember_token,
:expires => 1.year.from_now,
:domain => ‘.myapp.com’}

when logging out -

cookies.delete :myapp_cookie

Any help would be greatly appreciated.