Cleaning Ground Contact Points on Engine and Starter

What happens here

To ensure good electrical contact, the creator uses a cordless drill equipped with a wire wheel brush to meticulously clean the engine block where the starter bracket will mount. He advises getting down to bare metal to remove any rust, debris, or paint. He then repeats this cleaning process on the starter itself, focusing on the mounting bracket areas to establish a solid ground connection and complete the electrical circuit.

Goal: Establish clean and conductive ground contact points for the starter