To clean and maintain the Evans Torque Key, wipe it down with a damp cloth after each use. If necessary, use a mild detergent to remove any dirt or grime. Avoid harsh chemicals or abrasive materials, as they may damage the key. Regularly lubricate the tension rods and lugs to maintain the accuracy of the torque key. It's important to keep the key dry and safe when not in use to prevent rust or corrosion.