This method only works on certain hinges. First, use appropriate safety and protection equipment, such as work gloves and goggles, or get a licensed professional to help you out, if needed. Protect the area with a suitable covering. Next, pop off the cap on the top of the hinge using a sharp regular screwdriver. The cap is probably caked with paint. The bottom edge of the cap is about 1/8 inch down. Place the screw driver and give it a solid whack with a rubber mallet and the cap should pop right off. Squirt some household oil (motor oil will work) in the hinge then open and close the door and add more oil until the squeaking stops. A paper towel may be needed if oil drips out of the bottom of the hinge. Place the cap back on and lightly tap it into place. Repeat on the other hinges.
If you hear any common area doors squeaking, let us know.