Hell you can soak the whole thing in distilled water if you (A) do it with the keyboard unplugged (B) Rinse it well so it washes out the gunk (C) blow dry or airdry it out afterwards and make sure it is ALL dry before plugging it back in.
Best to take the key caps off so they don't cup the drainwater and feed it back in.
If you leave water in it, or leave trails of sediment from mineralized water lying across the circuits, it will hose the board up in fine form, but if you don't make these errors the worst outcome will be no worse than you went in and the best will be the keyboard will be as good as new.