I abuse my laptop. I can't help it. I'm constantly on it, mistakenly touching its screen and leaving my fingerprints all over. So how does one protect their screen? Aside from being more cautious, you can use LappyMats, an ultra-microfiber cloth that was designed to protect your laptop's LCD screen.
The mats act as a soft cushion to be laid in-between your laptop lid and keyboard to provide full protection from scratches that are caused by your keyboard or trackpad while traveling. You can also use the cloth to clean dust, dirt and everyday oils off any part of your laptop.
The screen protectors are available for just about any make or model of laptop/notebook on the market from 11.1” widescreens all the way up to 20” custom laptops. They cost $10-20.