Turn the floor fan off and unplug it from the wall.
Remove the screws from the floor fan’s front cover--also known as grill--with a screwdriver. Typically, you will need to Phillips head screwdriver. Place the screws in a safe location. After the screws have been removed, gently pull the cover off the rectangular housing. Repeat the process for the floor fan’s back grill.
Remove the mounts or screws to disconnect the fan blades from the motor. Lay all the pieces out in front of you.
Fill a bucket with 1 gallon of cool water. Add 1/4 cup of liquid dish soap. Mix the contents together thoroughly with a wooden spoon. Submerge a cloth in the mixture and wipe all parts of the fan--except the motor--with the cloth.
Saturate an old toothbrush in the mixture and scrub the floor fan’s front and back cover. Continue scrubbing until you have thoroughly cleaned the grills.
Wipe all fan parts dry with a towel.
Brush dirt, dust, hair and other debris off the motor with a dry, soft-bristled brush. Do not allow the motor to get wet. Alternatively, use a can of air to blast away any dirt or dust on the motor housing.
Place a drop of SAE 20 non-detergent oil into each oil port. Spray a lightweight lubricant on the shaft of the motor.
Reassemble the floor fan. Attach the fan blades to the motor. Secure the front and back cover to the fan’s housing.