I have had this bird chirp sqeak that has been driving me nuts. Suspension bushing, hood latch, door latch. None of them were it. Finally found it: muffler hangers. Esspecially the rear one. Were the hanger from the muffler meet the rubber hanger. I just hit it with WD-40 cause that was all I had with me. It quited it down but did not go away. What do i do to cure this permanently.