Your charging circuit is good (you already knew that). There are many other parts/circuits inside a laptop that must also be good in order for it to function. If you did not open and clean the laptop (sounds to me as though you didn't) there could still be moisture inside, or sugars shorting contacts on the logic board.
I've edited your tags on the right to include two that will offer more insight into why your laptop won't boot and steps you'll need to take to "possibly" resurrect it. Study them for steps solutions.
If you intend to DIY you'll have to open and examine the inside, you'll want to be certain it's dry inside (BTW do not blow air on/at it-that only moves the wet around to where it's dry) clean and examine the RAM and the keyboard to determine if they are the damaged parts (If you're fortunate perhaps only the top case [power button] was damaged). As you do that examine what you can see of the board with a magnifying glass. If you see burn marks or corroded traces/components you'll need to replace the logic board (cleaning can't repair a damaged component).
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