Spilled cognac on my keyboard, changing logic board.

Hi!

I spilled cognac on my keyboard and after several minutes it just shut down (For obvious reason). I assume the logic board is fried and I bought a new one, but the question here is:

I should probably clean the cognac, but how? It’s underneath the keyboard and how should I clean it?

How can I tell if the old logic board is fried? or is it another component that might be damage? I think I see some areas of the logic board that are darker which could indicate where the liquid is.