Step-by-Step Method
1. Turn Off and Unplug the Fan
Safety comes first. Make sure the fan is completely unplugged before cleaning.
2. Spray Cleaner Through the Grill
Lightly spray the front and back grill areas to loosen dust stuck on the blades.
3. Cover the Fan With a Plastic Bag
Place a large plastic bag over the fan, just like in the picture.
4. Turn the Fan On for a Few Minutes
The spinning blades will blow loose dust into the bag instead of spreading it around the room.
5. Wipe the Outside
Remove the bag and wipe the grill and outer surface with a dry cloth.
Final Result 
A cleaner fan, better airflow, less dust in the air, and no need to disassemble anything.
