How can we repair our metal door so it doesn't squeak when opened?

I have a metal screen/storm door with hinges that squeak loudly! I get up early; I'm in and out of the door all morning long. There is a bedroom right next to the door. Sigh...I've tried WD40 and oil, but it only lasts a short time. I can open the door 3-4 times with no noise and then it's back to that horrible metal squeak.Any other solutions?

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