Dust on ceiling fan blades can fall into the room and add imbalance. Cleaning is safer when the fan is fully stopped and the worker has stable footing.
Turn the fan off
Switch off the fan and wait for the blades to stop. Use a stable step stool on a clear floor, or use an extendable duster from the ground.
Contain the dust
Slide a pillowcase or dusting sleeve over each blade and pull dust inward. Support the blade gently rather than bending it.
Wipe the housing
Use a barely damp microfiber cloth on accessible surfaces. Keep moisture away from the motor and electrical controls.
Check for imbalance
Run the fan on low and listen for wobble or new noise. A bent blade or loose bracket needs repair before continued use.