1) Understand how retailers think. It costs about five times as much money to bring in a new shopper as it costs to keep you as a loyal customer. Managers expect store returns and know that one of the top reasons you choose a store is because you like its return policy.
2) Have proof of purchase. The top priority is to have a full receipt, a gift receipt or some other proof of purchase.
3) Keep the packaging.
4) Use good manners. The customer-service clerk is harried, wants to quickly process your return, and then move on to the next person.
5) Come prepared. Have your receipts in hand, wear comfortable shoes, and get a shopping cart to lean on.
6) Know individual store policies ahead of time.