Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [header] How to clean an electric motor [title] Disconnect the motor and remove it from its mounting. [step] Unplug the motor from its power source. Power should not be running into the motor, or else you're in for a shock.

Ending1: Unscrew any bolts holding the motor in place if there are any. [substeps] You can test the motor with a multimeter if you think it may have an electrical charge. Ending2: Gently pull the motor out of its mounting compartment, then lay it out on a table or other flat surface. [title] Rinse the motor and reattach it to its housing. Ending3: [title] Scrub the motor to pick up dirt and grime. [step] Hold the motor by the rotor and use a soft rag or toothbrush to scrub off paint, grease, and grime. Ending4: Unscrew the mounting nut holding the motor on with a screwdriver or hex key. Inspect the motor closely while it's disconnected from the electrical adapter.

Answer format: ending1/ending2/ending3/ending4