Are you sure that the streaks are being caused by water under the screen or from water (or something else) trapped between the Invisible Shield and the screen. It seems that you've left the Shield on by stating that it looks great and I'm wondering what it would look like without the Shield. I am also curious as to how the water got in there. I would think (and I'm not an engineer, so I don't know) but I would think that the holes for the speaker do not feed directly into the screen compartment. I would think that the screen itself would be seperate from the rest of the components. However, I did get dust in mine, so that can't be completely true. Though, with the screen being charged, the dust would be attracted to it (the screen) which I don't believe would happen with the water.
I do feel sorry for you that it happened and hope that you are able to resolve your issue.