Delete cookies in iPhone sdk

NSHTTPCookieStorage* cookies = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSArray* projectCookies = [cookies cookiesForURL:[NSURL URLWithString:@"www.yourSite.com"]];
    NSLog(@"Cookies %@",cookies);
    
    for (NSHTTPCookie* savedCookie in projectCookies)
    {
        NSLog(@"cookies is %@",savedCookie);
        [cookies deleteCookie:savedCookie];
    }
        NSLog(@"Cookies %@",cookies);