I always keep my Ipod in my case, but today I noticed that it was getting kind of dirty in a few areas. So I took it out to clean it and decided to cleen the screen too. I had a screen protector on and this was the first time taking it off since I got it in December. Now when I pulled it off there is a big spot of the adhesive crap on my screen that won't come off. Anyone know how to get that off? I already tried cleaning it with windex. I don't want to experiment with harder chemicals until I know what I should be using.