It is easy. On my intake, the MAF on the intake tube; the black square held on by two bolts between the two clamps. The MAF in the picture below is stock, so yours will look the same, or similar. Just unscrew the two bolts holding it on and using a q-tip and rubbing alcohol, gently rub the 'dew drop' looking sensor portion. It will most likely look dull/dusty before you clean it. But once you clean it, it will look shiny again.
