Cookies is not being delete in IE8

While testing the application I am writing, I found that IE8 is not clearing the cookie I have set even I deliberately go delete it. It turns out that IE8 has a default "Preserve Favorites website data" setting which will prevent the cookie of my "favorite" website being deleted! How smart it is !!

So for me to delete the cookies I need to do

Tools -> Internet Option -> "General" Tab -> press "Delete.." button -> uncheck 'Preserve Favorites website data' -> press "Delete"

reference : internet explorer 8 - Cookies are retained even after explicit delete in IE8 - Super User