Well as a past computer repair person, circuit boards are not opposed to water as long as they have no power to them.
unless they have capacitors on them, then power should be removed for at least an hour.
Wash in clear clean warm water, then dry with a hair dryer.
I once had a coin dispenser that had a can of coke spilled into it. I went and got a bucket of warm water, as I disassembled the unit all electronic parts went in the warm water. took out and rinsed, dried with hair dryer, and reassembled worked perfectly.
Wiping down with damp rag, while powered down and power removed, once wiped down dry with hair dryer.