How can I quiet squeaky door hinges?

Spray a penetrating lubricant like WD-40 directly onto the top of the hinge pin and into the hinge joints. Have a rag ready to catch any drips. Open and close the door several times to work the lubricant thoroughly into the hinge mechanism. Wipe away excess lubricant.

If you don't have spray lubricant, apply a few drops of household oil (like 3-in-1 oil, sewing machine oil, or even olive oil in a pinch) onto the hinge pin and joints. Alternatively, smear a small amount of petroleum jelly (Vaseline) onto the hinge pin. Open and close the door to distribute the lubricant. This method might require removing the hinge pin partially or fully for better application.

For persistent squeaks, close the door and use a nail or awl placed under the hinge pin head, gently tapping upwards with a hammer to loosen and remove the pin. Clean any rust or grime off the pin with steel wool or a rag. Apply lubricant (oil, petroleum jelly, or graphite powder) directly to the pin and inside the hinge knuckles. Reinsert the pin, tapping it back down if necessary. Wipe away excess lubricant.