Regular cleaning of DC computer case fans is essential to maintain their performance and lifespan. One of the simplest ways to clean the fan blades is by using compressed air. Hold the can of compressed air a few inches away from the fan and gently blow air onto the blades. This will dislodge the dust and debris accumulated on the blades. Be careful not to spin the fan blades too forcefully with the compressed air, as this can damage the fan's motor.

If there is stubborn dirt or grime on the fan, you can use a soft - bristled brush, such as a paintbrush or a small cleaning brush. Gently brush the blades to remove the dirt. For the fan's housing and the area around the bearings, you can use a cotton swab dipped in isopropyl alcohol. This will help clean any sticky residue or oil that may have accumulated.

Before cleaning the fan, make sure to turn off the computer and unplug it from the power source to avoid any electrical accidents. If the fan is removable, you can take it out of the computer case for more thorough cleaning. However, be careful when handling the fan to avoid bending the blades or damaging the wires.