I tried looking for another thread regarding this issue but couldn't seem to find one that talked about the Smart Cover's affect on screen protectors rather than the screen itself. It is my understanding that you can wipe away the three vertical "lines" that are left behind by using a smart cover. However, you can not wipe these lines away on a screen protector. At least, not a Zagg InvisibleShield. I've had to replace my InvisibleShield 3 times over the past year due to permanent stains from my black leather Smart Cover. My question is to people who don't use screen protectors: after a year of the iPad 2, are the vertical lines still able to be wiped away? If so then I won't even bother with a screen protector on the new iPad. It just now hit me that it's kind of silly to even use a screen protector with a Smart Cover anyway. However, if the stains are permanent, that's another story. Anyone? I find it odd that this issue isn't discussed far more often.