The laptop is probably beyond economical repair. Applying power to wet electronics usually causes additional damage.
If your lucky you could remove the battery from laptop. Let it dry out for a week or so and then install the battery and try again.
99% of the time when power has been applied to wet electronics it causes the electronics to eat its own electrical connections through electrolysis and create crystalized lead, tin, copper oxides which are conductive and cause shorting between signal traces etc.
If you have any important data on the hard drive you might get lucky and be able to install it into an empty external hard drive enclosure case and connect to it from a healthy computer with good virus protection on it to avoid cross contamination if anything bad was on the laptops drive to not infect the other system.
