Prepare to quell the squeal before you eradicate the squeak remove the refrigerator contents from the door compartments and shelves.
How to fix refrigerator door hinges.
To realign the lower door adjust the middle hinge.
Clean the refrigerator door gaskets with warm soapy water and a soft cloth.
Clean inside the folds of the accordion style gasket to get all of the grease dirt and grime from the surface.
If the hinges are bent causing the door not to open and close properly you will have to replace the door hinges.
You can follow the steps in this video to help you do this easy repair.
Moving the middle hinge will affect the upper door so you may have to adjust the top hinge afterward.
The refrigerator door lubricant within the hinge can be removed along with the crumbs or caked liquid that was cleaned out of the hinge.