PLEASE EXCUSE MY GRAMMAR ERRORS!
ive been tryong out many things to clean my psp but seeing as how that screen is quite sensitive i wasnt to sure on using chemicals BUT! i did getthe guts to use some SILICONE SPRAY and it works wonders leaves it just as i bought it but make sure when applying you do not spray it like if you were painting the damn thing just spray ONCE! but make sure it covers the whole PSP!and DO nOT wipe off for about 3 minutes or 5 just let it sit a little. after that just use same little rag PSP came with and clean it. and you shoudl see some great results atleast i tihkn so also if u have a really irritating SMUDGE on your psp and u just cant take it off try using some of those little alcohol wipes that come in the little poutches a little goes along way so i would just tap the wipe on the spot were you smudge is like only once and blow air onto the alcohol and it shoudl dissapear before your eyes...lol after that just use your litle PSP rag again and voila!! nice and clean psp! as for the little tiny grimes on the hard to reach edges im still to thikn of somehting im kinda looking at the toothpick area not quite sure..
PS: use my advice at your own risk i will not be held liable for misuse of any pruduct talked about ... just make sure u do as i said i never had porblems so i hope u dont either. if this info even remotely helps anyone ummmm.... then thats awesome glad to helP!