I recommend taking it to a tech to have it checked.
We once spilled a beer on our 64 channel board. Took the covers off and let it dry out for a week, turned it on and it worked except for having to clean some of the sliders. We were very lucky.
nothin u reall can do usually this electrical components of the amp get ruined when there wet you could either take a blow dryer and try to dry it out completley or u could just get a new head i mean what im sayin isnt somethin u should jump at automatically but from my own personal experience i lost two amps that way and like i said the electrical components in the amp usually get ruined when they get soaked