Clearing cart contents on success page

Hi Guys,

I know that this has been talked about on the forums but every solution i have tried fails to work.

Background.

Front end shopping cart works fine. I also have a secondary shopping cart in the admin side to add order's to the database if items are purchased off site.

This works well except

When you put an order through the cart keeps the previous shopping details.

Solution i have tried also destroys the login session so i have to log back in after checkout which is not a desirable outcome, but the cart is cleared.

If anyone can help it would be greatly appreciated.

Kind regards

Jonathon

Added my Confirm and Checkout success pages.

I have also noticed that when checking out that it over writes the last order. I am guessing that its not clearing the user session variables also.