First of all, you need to take a soft, dry cloth, wipe up any spots on the doors and vacuum the hinges. Clean the doors with warm, soapy water starting from the bottom. Rinse with clear, cool water and the sponge but this time you need to start from the top of the door. The fingerprints and all stains what are hard to remove, you can treat with the raw potato.
Squeaking door hinges may be noisy for several reasons but the best way to fix it is to make a solution of the kitchen oil and the graphite form the pencil. Lift the door about one inch and grease the hinges.