How to fix a creaky door and windshield wiper?

[jbach36]

1) On my W124, I have a creaking driver's door. I put my finger on both hinges while closing and they don't have vibration in it. I put my finger on the flat piece of metal in the center, and that does creak. How do I fix that? If I had Xray vision, I could see what's on the inside of the door to see what's causing trouble. I don't want to just shoot oil in there without seeing where it's going.

2) My monowiper blade squeals even in the rain, seems to be coming from the top of the blade, which is pretty new. What would cause this, and how to remedy?

Thanks ,

jeff
1991 300d, 90k