Which of the following should be done to maintain a clean working environment when servicing laptops?

Using compressed air to clear dust is an effective practice for maintaining a clean working environment when servicing laptops. This method allows technicians to remove dust and debris from hard-to-reach areas, such as the keyboard, vents, and inside the device, without causing damage to sensitive components. It helps ensure optimal airflow, which is crucial for the laptop's cooling system and overall performance.

Other methods, such as using ammonia-based cleaners on screens, may not be safe for all laptop screens and can potentially cause damage. Holding devices by the screens can lead to physical harm to the display, risking cracks or other damage. Storing tools on the keyboard can not only create clutter but also risk damaging the keys or the internal components if any tools fall or are pressed during the servicing process. Thus, using compressed air emerges as the recommended best practice in this scenario.