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iMore Question It was only for about 15 seconds but the screen wont go further than the apple logo
Replace it.
Remember, it isn't the water that does the damage. It's the combination of water and electricity - the act of applying power to wet electronics - that causes the destruction. The voltage will follow the water, and short circuit the device components in a nanosecond.
How long ago did the device get wet? How soon after that was power applied? If the internals were not absolutely bone dry, any voltage will start frying things. Sooner or later, it will die. Sounds like in your case, it's sooner.