Well, There is actually a loose seal around the buttons, so blowing in through there wouldn't works so well if thats what you were planning. Also there is what seems to be a loose seal at the edges of the screen. So getting air at the screen without opening the psp may not be possible.
It's rather easy to open the psp, so I think opening the psp in the bathroom after taking a warm shower (the moisture in the air keeps the air dust free), and then using the compressed air to blow off any dust, is your best bet.
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