The refrigerator door lubricant within the hinge can be removed along with the crumbs or caked liquid that was cleaned out of the hinge.
How to fix refrigerator door hinges.
Clean inside the folds of the accordion style gasket to get all of the grease dirt and grime from the surface.
Adjust only the top hinge to straighten an upper door.
If the hinges are bent causing the door not to open and close properly you will have to replace the door hinges.
Then align the door with the top of the refrigerator.
To realign the door just pry off the hinge cap and loosen the hinge screws.
Prepare to quell the squeal before you eradicate the squeak remove the refrigerator contents from the door compartments and shelves.
You can follow the steps in this video to help you do this easy repair.