Ipad got wet works sometimes

Hello,

My ipad got wet (milk) some months ago. I stored it in a sealbag with some silicium for the time being.

( For i picture how it looks: http://i61.tinypic.com/2nvfcj7.jpg )

The defect was the screen, there was a white transparent over the icons. I could stell see everything but not good at all.

I just started my ipad after some months in silicium and i still had this defect. After a failed factory reset (loading but had to stop i with a hard reset) the screen seems to be normal again. No white but a clear beautiful screen.

After a celebration of 30 minutes the party was blown off because it got back again. First the sides of the screen and the rest quickly fallowed. I repeated the reset thing i deed before and it looks good again.

Has somebody any idee what this is and how i can remove the defect completely?

Sorry for my English, it's not my native language.