We can't warranty any keyboard repair in such cases. We do replace missing key tops but even that is done as-is and warranty ends when they leave the store.

You can google how to try to clean these keyboards but our experience is such cleaning is iffy at best and the client expects our repairs to return the keyboard to near like new performance.

Given that we talk it over with the client and replace keyboards in such situations. It depends on the laptop model but some are 5 to 15 minute jobs so we give the client a break on the service charge but some laptops take the full hour and it's expensive work.

The average back lit keyboard has been running about 99 bucks. Figure maximum 150USD for labor and you see why drinks have to stay away from keyboards.