Hello forum, I keep finding that there is dust under my iMac screen. When I remove the glass planel to clean it and put it back, there is inevitably ALWAYS some dust that gets in between the second I wipe the screen and second I put it on. I know it's just a very simple thing yet it is really really annoying me. I've spent hours over the past few weeks doing this and it's driving me mad. All I want is a screen with no dust. I heard I can use canned air. If so, how exactly would I go about doing this? Spraying the canned air inside? Thanks.