Strange screen streaks / smudges: disappear when I wipe, but then come back

My 13" macbook pro display has a strange glass issue. There are horizontal streaks across the screen that look like somebody wiped dirty water across the screen and let it dry. They can only be seen when there is light directly on the screen, or overhead light. If there is no direct light, it isn't visible from any angle.
The strange thing is that when I use a micro cloth to try to wipe them away, it looks like they disappear but then, within a few minutes, the streaks will reappear. I thought that it may be something on the other side of the glass, but then why would it look like they disappear? As I said, when I look at the screen from below or above under indirect light, the surface look 100% perfect -- it's just when there is direct light or overhead light that the ugliness is visible.
Any thoughts on what this could be? I know I need to take it in, but would like to understand what this is...
Thanks!

I have this issue as well with my MacBook Pro. I'm going to do more testing but I had dirty water looking blotches across the screen. I wiped them off and it looked perfect with the cloth. This morning they're back. You can only see it when the light is right and the screen is dark. I was thinking that because my office is about 68 degrees that the laptop heats up and when I shut the lid it cools down and condensates. Just a thought its not humid in the room and I don't have any windows.

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