I've used the cleaning kit sold by enTourage and last cleaned it about two weeks ago, but no marks then, just one deep scratch that didn't come out. The marks are only visible when the screen is off. I hope I didn't get a defective touch surface that is going to wear out fast. I won't be able to replace my eDGe for several years, unless I win the lottery ;-)

The marks almost look like water spots, but no water has ever gotten on my eDGe.