Disconnect the battery and pull it out immediately. Take the board out of the case and put it in a sealed container with lots of rice or a dessicant like silica gel.
Let it sit for 24 hours, then douse it thoroughly with isopropyl alcohol, then let dry for 30 minutes.
Clean the connectors with electrical cleaner and plug it all back in. It may be ok.
Dry out the interior and clear your drains.
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