How can i fix my sony ericsson c902 from water damage?

I have a sony ericsson c902. It was in my pocket when all of a sudden it started raining very heavily and by the time i got home my clothes were soaked the phone in my pocket was wet. I dried it off with a towel and thought no more of it however when i came to use it none of the buttons worked. I removed the battery and then replaced it and switched it back. This made all of the buttons work apart from the "up key".

Nothing i have tried seems to make that last key work.


Any help would be much appreciated.

Thanks,
Tom roberts.