My HTC Hero which I have had for about 4 and a half months seems to be getting dirty from the back. It looks like seem green ink or something that seems to be painted on. It is a very dirty green, I tried everything to get rid of it. Heck, I have even used bleach but nothing works. Does anyone have any idea how to remove it? Worst case scenario I'll just buy a cover to hide its imperfections. All of sudden the black version doesn't seem that bad anymore :$