How to get rid of a black dot underneath the iphone 4 screen without taking it apart?

Ok so i just came back from the mall with my friends and my iphone 4 screen got really dirty with finger smudges on it and a lil dust. So i get home and i wipe it off with my hand and i look at this little black square on my phone and i could see it cuz i was on instagram at the time.anyway i looked and i couldnt wipe it off i tried and tried and tried and i would come off and i double check and it lookes like its underneath the screen! How do i fix it?

Sounds like a dead pixel. I don't think you can really get it "fixed." I'm pretty sure you'd just have to have the screen replaced.