The two things water does are

1. act as a short circuit, since it’s conductive and spreads over everything rapidly
2. leave residue/corrode, coincidentally doing the opposite by blocking circuits over time

You can extract all the water, but unless it’s producing vague bios errors, there’s no way of knowing what has failed. Similarly for corrosion, you would need to thoroughly pull apart and clean off residue.

There is, however,.a chance everything’s fine like the device wasn’t powered on at the time to have voltage short circuit across components and just needs a clean.

So, I think your success rate with drying out notebooks would indicate that it’s more effort than it’s worth.