Hey folks; if you can remove the keyboard, just hold it upside down and wash the whole thing off with a soaking wet cloth, then let it dry for at least 24 hours, (depending on the relative humidity where you live) two days is better.

I've done this on many different keyboards, even holding them under the tap to wash out any residue, as long as there's no power and you dry off all the water, (contact cleaner might be better,) the keyboard should work fine.