well, if it is dead already, no harm dismanteling it. Take some photos where what goes. Battery goes first, when you reached the keyboard foil check for trapped moisture between the 2 plastic layers, evtl. open up and wipe the contacts. Remember, you can only win.
All the flat cables are held in place by the little black bar on top what you can easily flip up.
You should see where the water penetrated (use mangnifying glass).
If it still will not work, sell for parts, battery, screen, case and maybe the main board still should work.
check for youtube videos
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1981 soldered my first Sinclair computer 1K, tapedeck * 1984 build and sold IBM clones 8Mhz, 512K, 20MB HDD * 2018 messing with ultrabooks
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