I tried the white lithium grease on my 92 sc400 driver door and it seemed to work for about 2 days. After a few more weeks of ripping the interior panel free of the door, I broke down and bought a new hinge from the dealer. $339. Put the hinge in my trunk until I could devote the time needed to install it. Before that day arrived, the old hinge made a tremendous pop as I opened the door. It has been smooth as butter ever since. So 4 months later the new hinge is on ebay, Lexus dealer wouldnt take it back, and me crossing my fingers that another pop doesnt undo the fix. ;-)
The lithium grease is definitely a good idea to try first.