Got wet: how can I dry it?

My phone got slightly wet with sea water, just a splash. Immediately the menu button in the middle stopped working, as well as the sound, but it still worked. A day later it got very, very slow, with several seconds delay when touching screen, or totally frozen. Four days later it is getting itself worse and switching itself off. Just getting worse.

I put it immediately in a jar with rice after removing battery, sim... Been aired and dried with cold-air dryer.

I am thinking of opening it to try dry it further, what do you reckon, what can i do.

Thanks