I also cleaned the throttle body and upper intake manifold when I was cleaning the EGR valve. It comes off with 4 bolts and then you have to remove the coolant lines. You can see the before and after. There is a fair amount of carbon build up and then I wiped it down with carb cleaner and then moved on to spraying the intake manifold. I thought I had taken pictures of it cleaned but I can not find them. The removal and installation was fairly easy.