Open all three drawers next to the fridge and take the items.
Look in the sink. Put the jar of water into the clear bucket, then the cup, then the knives. The water will overflow and wet the cloth next to it. Pick up the dark cloth.
Look on top of the microwave and notice it's filthy. Use the cloth to clean it. It will give you the clue "Door: 5 second and 10 taps"
Go to the door and tap it 10 times within 5 seconds.