I read that compressed air can cause problems if the pc is plugged in even while off. Interestingly last year I noticed a tiny bit of corrosion on my gpu. I cleaned it off with 91% alcohol really good and its been probably six months and the card performs optimally and with no heating problems and the corrosion never returned. Should I unplug the pc every time I use compressed air? Can dust build up behind the mobo eventually become an issue? Im a little bit worried about the prospect of shorting out a mobo trying to take it off and clean behind it.