Dust under the screen

i bought a psp and i had a little dust under the screen along with a scratch on the underside of the screen in the upper left (i dont care bout this). how in the hell do i get rid of this? i doubt any r dead pixles cus wen its off and i angle it i can see the dust. i am one of those ppl who you always see claning there glasses (which i do compulsively) so im also a bit (bit is an under-statement) OCD bout my screen being dirty. im thinking of taking the top 2 screws that hold the face on, of slightly bending the face up, and spraying some canned air under there. and suggestions????????