Customers cart not clearing after purchase

Yeah I'll do some testing but regardless of whether kind items show my main issue is PayPal not redirecting after credit card payments, then customers ending up back at site, seeing their items in cart, thinking they haven't made the order, re-ordering and creating a duplicate order.
So unless express will clear that shopping cart regardless of the route they take back to my site it will not solve my problem.
Does that make sense?

So unless express will clear that shopping cart regardless of the route they take back to my site it will not solve my problem
Why don't you get off the pot and try it??

kobra:

Why don't you get off the pot and try it??

get off the pot? are you suggesting I am a drug user?

I am trying to get as much information as possible before I try anything as I process hundreds of orders fine. the clearing of the cart is just a confusion for the customer. I would have thought if everyone else seems to use express that someone should be able to tell me if the customers cart is cleared without the need for returning back to the site via the checkout_process page. if they still need to for this to happen then switching to express will have ZERO benefit to me other than disrupting a busy live website.