There are a few ways to clean your grapichs card fans. The easiest way is to use a mild soap and water solution. Be sure to use a soft cloth to clean the fan blades and the card housing. Another way is to use a vacuum cleaner with the hose attachment and suck out all of the dirt, dust, and other debris that has built up on the fan blades. Finally, you can use a hairdryer on high heat to dry off the fan blades.