How clean is your computer? Is there food in the keyboard and dust on the vents? The dust on your computer can actually cause problems in the long-term, and keyboards are notorious for holding onto germs.

Your janitorial service cleans the building, but the computer is up to you—thankfully, it’s not hard and won’t take a lot of time. In 20 minutes or less, your computer can be in much better condition. Here are the guidelines, and if you want to clean inside your computer or just want more information, Microsoft has cleaning tips for computer owners.

Step-by-Step Cleaning

Step #1: Dust. Dust building up on your vents and fans can cause damage over time, so the best thing you can do is get rid of it. Before you grab a duster, though; there’s a better way: soak a paper towel in a little bit of rubbing alcohol and ring it out (disinfecting wipes will work the same way).