Just like any piece of furniture that sits in one place for a long time, the spaces in between your keyboard are going to gather dust. These particles, combined with any miniscule food crumbs, are nearly impossible to remove with gentle shaking alone. That's where compressed air comes in. Compressed air, which is exactly what its name implies, comes in a can and can be purchased at any office supply store, super store, and even on Amazon. These cans are fairly cheap. And what makes them most amazing and useful is the fact that they are like a power cleaner for your keyboard. They can get out the dust in that random corner of your keyboard that you didn't even know you had.