Dust under the PSP screen

[andrewset]

I know dust is made of magic, but how does it get under there, and is there some convenient enough way of cleaning it out?

Thanks

EDIT:
Someone on another forum showed me this easy guide to opening the front plastic of the PSP:
http://www.llamma.com/PSP/PSPTearDown.htm
I just completed it myself (less than 10 minutes, especially if you have the screwdriver handy), and I recommend it, if the inside of your screen is too dusty.
It also makes it clear that you could easily buy and use a replacement screen instead, if yours is scratched up too much!

Thanks