Hi @johngig
Water and electronics and electricity are not a good mix.
The impurities in the water causes corrosion and provides circuit paths for the electricity which were not in the laptop’s operating design and could damage the components. The corrosion start immediately and is ongoing until it has been properly cleaned away.
First do not try to charge or to turn on your laptop and then remove the battery as soon as possible to prevent any further damage. Even if the laptop is off, there is still power available at various points on the motherboard. The laptop’s power on/off button is not a power isolating switch. Think of the laptop as being in an extremely low power state when it is off rather than being disconnected from any power source.
Then you need to disassemble the rest of the laptop and clean all the affected parts using Isopropyl Alcohol 99%+ (available from electronics parts stores) to remove all traces of corrosion and water. Do not use "rubbing alcohol" as in some cases this is <70% IPA, can contain additives and is not as effective. If you do have to use it, check the label to verify the amount of IPA. The higher the concentration (%) of IPA the better.
Here is a link that describes the process. Electronics Water Damage
As always with electronics, especially surface mounted pcb be gentle when handling and especially when brushing away the corrosion. You do not want to remove any components from the boards. You will also have to remove any shields that may be covering some components as the water may have got in under them as well. Also disconnect any flex cables and clean the ends of the cable as well as the connectors that they were plugged into.
Hopefully after you have done all this the laptop might possibly work correctly again.
You didn’t give the model number of the laptop so either search for it here on ifixit or look on YouTube to find out how to disconnect the battery (if it is an internal battery) and how to further disassemble the laptop.
If this process seems too daunting, take your laptop to a reputable, professional laptop repair service, experienced in water damage repair and ask for a quote for a repair.
If you decide to do this, do it sooner than later.
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