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Hi @Kps3,
Welcome to the community. I am sorry to hear about this. 
You can try to heat up the device to try to evaporate the moisture. The easiest way to do this is to use a high performance app such as a 3D game or video recording.
If this does not work, contact your Local support team to arrange a repair.
One thing to note, the Xperia X does not have an IP rating, and thus is not waterproof. Only the Xperia X Performance and the Xperia XZ are.