ie 9 not deleteing cookies c#

I have the following code:

 var basketCookie = GetBasketCookie();
        
        basketCookie.Expires = DateTime.Now.AddDays(-10);
        Response.Cookies.Add(basketCookie);

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And this is the function:

 public HttpCookie GetBasketCookie()
    {
        var basketCookie = Request.Cookies["basket"];
        return basketCookie;
    }

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For some reason the code I am using to remove the cookie is not being removed in ie9 meaning if they go back into the basket page their order is still in the basket.

This isn't what I want. Is working fine in other browsers.

Its worth nothing that even if I do delete cookies in ie9 the cookie won't die....

Works fine locally even in ie 9 just not when i'm running the live site.

Is there any sledge hammer way of killing the cookie in code?

Die cookie die!!!