I borrowed this thing that exerts air really strong and fast.(it's used to clean out Keyboards and other things with keys) one spray, and whatever it was under the button on my PSP came flying out. it's a little larger than a grain of sand, I don't care what it is, but my PSP works fine now and I am so happy.
I really didn't think it would work. I look forward to spending many years with my PSP.