How to Clean a Computer Case Fan

"Hi welcome back to expertvillage.com and now we are going to spray some of the case fans right here. I got like three. Two on this side and one over here. Okay I'm going to turn the PC around so I can show you here. Here is the weary fan. Make sure that you hold the blades spray from the inside going out. You could see the dust coming out on the back side. Okay next thing that we are going to do. Okay last is to spray right here on the bottom of the case. Okay that is it."