Well i have Dust under my psp screen like little particles and i was wondering how to get it out i know you guys are not google but it gets annoying when playing games!
all I could say is try to use some compressed/canned air or something, or as said above, taking it apart. I'm pretty sure that would invalidate the warranty or whatnot, if that bothers you.
i wouldn't do a thing, if you can still play games on it, it's fine right?
and if you do decide to take it apart, be very cautious
those things are virtually impossible, take that from the guy who always has one or two screws extra in the end >_<