Very Stiff Mailbox Hinge

The heavy duty mailbox that my husband made over the years has become very stiff and hard to open. Our Mail Delivery person found it difficult to open easily so we sprayed WD-40 on the hinges to make it function properly. WD-40 MULTI-USE PRODUCT worked like a charm on the rusty, stiff hinges very quickly and now the door on our much treasured old mailbox function perfectly. Thanks WD-40!