What kind of service you get depends on where you are in the world. In the US, Apple are the gold medal in service and repair, However, few if any Apple retail stores do involved repairs on site. Most devices go to a centralized repair facility, and consumers can do the same using Apple's "send in" service option.
Outside the US and EU, service can be a "Wild West" show. Apple has no power to police people and firms who falsely claim to be "Apple Authorized." Make sure to thoroughly vet any candidates, including finding out if they use genuine Apple parts.
If you give use a rough idea where you are in the world, we can point you to the nearest Apple corporate presence. They may be able to help with the vetting.
That said, it's time for a bit of realism: few notebook computers that are wetted have a positive survival outlook. Liquids, even plain water, can hide in areas that cannot be inspected for moisture or accessed for drying. Failure tends to be progressive as moisture creeps into components. A service person can clean and dry as best they can yet your computer may still fail weeks or months later.
If you have homeowners'/renters' insurance, but them on notice of a potential loss now. It may be the only financial relief you get for this, subject to the usual deductible of course.
