Close up the PC and return it to your desk.Use the brush to wipe down components and other areas.While it's technically safe to use on PC internals, it's possible to draw liquid from the can so pay extra attention. It's important to hold the can of compressed air upright and to spray at a distance on components. Spray around the inside with compressed air. Remove the screws on the rear of the side panel.Depending on the design and construction of your PC, the below steps may alter slightly, but this guide should be okay for majority of chassis types. If possible, find a location outside since we'll be blowing dust around, perhaps a sturdy table in the yard. Move the PC tower to a cleared workspace. Right, now we have our arsenal of cleaning equipment at hand, there are a few steps to carry out before we can clear dirt and dust from within the case.