Where the customer session is maintain hybris B2B ?

Hi, I want to delete the customer session only for Deliver method which is stored in session ? Problem facing : once customer login to the storefront and add the product into the cart then place the order and logout then delivery method ie standard delivery is stored it in customer session due to that when next time customer add cart to product and proceed to checkout page then by default previous delivery address is selected ie standard delivery address , I dont want delivery address is already selected.