Loosen the bolts or screws of the appliance your motor's in. Disconnect any wires or screws that attach the AC motor and completely remove it. Carefully observe how the pieces you're dismantling were connected so you can reverse the process when reassembling. Wipe the AC motor's outer casing with a cloth moistened with a motor cleaning fluid.
Remove the motor pulley. On some AC motors you will you have to remove the screws of bell caps on either side of the frame the motor's in. Remove each bell cap by wedging a screwdriver under the lid of each cap and lightly tapping it apart from the frame with a hammer. On other motors, you will have to unscrew bolts and unlock the casting of the motor.
Undo carefully the wires connecting the motor armature or rotor and slide it out. Unscrew the carbon brushes. Use sandpaper to clean the metal cylinder at the base of the armature. Soak the brushes, bolts and screws in a saucer of motor cleaning fluid. Let them dry.
Add a drop of oil to both ends of the armature shaft. Reconnect wires and brushes. Put the rotor back into place. Secure the bell caps or casting. Remount the motor to the appliance and enclose.