2001 Grand Am, Squeaky Doors?

I need to know how to fix the squeaky doors on my Grand Am. I have tried using WD40 on it, and it does not work. The noise sounds like its coming from inside the door towards the bottom. Any ideas?
2001 Grand Am, Squeaky Doors?
Get a can of PB Blaster (like WD-40 but 100 times better) Hose the hinges real good and work the door back and forth a few times. Will take care of it and will last a long time. Good stuff. About 5.00 a can!
2001 Grand Am, Squeaky Doors?
Use a white lithium grease instead of WD-40. Use the straw to squirt it in between the door hinge crevices... it may take a few swings of opening and closing for the lubricant to work it's way through and around the hinge pin.