Drain all of the liquid from the keyboard by shaking. If the fluid in the keyboard was not plain water, rinse the keyboard out using plain water, preferably distilled water. Then, rinse out the keyboard using distilled alcohol. This will force the water out of the keyboard and allow it to dry better. Wait until the keyboard is thoroughly dry--this may take two or three days. The keyboard should then be usable, but don't try to plug it in unless you are sure it is thoroughly dry.