How do we DELETE this new Rails 2.0 "Cookie Store"?

Rails
1

In the past, I would run this code to clear my session and cookie
variables;

def clear_session
session[:user_id] = nil
cookies[:user_id] = nil
cookies[:password_hash] = nil
end

I would then go into my \Docs & Settings\user_name\cookies and clear
out the cookie file.
Now, in Rails 2.0 (using the new SECRET key) I can’t seem to LOCATE?
what file this is being stored in so I can;

  1. Clear it out (in code)
  2. Delete it manually
    I expect this is a common question.
    Thank you,
    Kathleen