They didn't wipe it, they probably didn't even just spray it, they either dunked or doused it in cleaner.
(HINT: With the item powered off, spray a rag while pointing away from delicate objects then wipe!)
If you are lucky, turning it off (NOW!) and letting it dry may allow it function again, at least for a bit. However, it has been damaged, how bad is hard to say and it could take weeks to dry depending on where and how much fluid got into it.
If it's a new super thin aluminum jobber, just toss the thing. It's not worth the effort especially considering how fragile and difficult to repair they can be (thanks Apple!). Just replace it with another on Ebay (they're pretty cheap) or as Apple people tend to do, make yet another pilgrimage to the Apple store and pray to your god, Steve by making a donation.
If it's an old Apple keyboard, or if it's a newer one and you are desperate to save it, power it off, disassemble it as far as possible then dunk it into a tub of isopropyl alcohol then allowing it to dry, this displaces the water and evaporates faster. Putting it into a warm oven (NOT HOT, as it can light the alcohol on fire) can also speed this up a bit. A bit of contact cleaner to clean up any corrosion is also a good idea, then reassemble and cross your fingers. Chances are the old one will work fine, the newer one, well you probably just made a mess that needs to be cleaned up because there's almost zero chance this went back together nicely, much less still functions as they were designed to be disposable (like almost everything modern Apple).