I recommend against using any hairdryer to clean a laptop. Hairdryers often have heat settings that go much higher than what is appropriate for laptop screens which can cause irreparable damage. For more safe and effective ways to clean out a dirty laptop. I'd rather you not risk damaging the screen of your computer just so you can speed up the process of cleaning it. There is plenty of other safer, cleaner, and more eco-friendly ways that don't involve high temperatures or anything risky.