Hoping you removed the battery from laptop as well. The battery is what will cause damage as it sits wet. The battery still applies power to some circuitry and so if that circuitry got wet wet electronics that have electrical potential eat away metal through electrolysis. Placing the laptop into a large sealed bag with dry rice is one way to dry it out, but only seen this done with cell phones. Most laptops that took a bath survival of them is dependent on how much liquid, where the liquid exposure and how fast electrical potential is removed from circuitry, as well as how quickly the electronics are dried.
If the laptop was left in direct sunlight and very hot to the touch for 3 days then it might be ok to apply power and see if it boots
