I once dropped a Vivitar 283 into the deep end of a swimming pool. I fished it out, removed the batteries, and dried it as best I could. I let it dry for a couple of days, and it worked just fine for years afterwards!
Although the salt water causes corrosion, you might rescue your strobe by removing the batteries, dunking and rinsing in clean water, and let it dry for a few days by a radiator or something.
Electronics can take a terrific beating and keep on working!
|Blue and yellow in water by fireplace33|
from Ink and water
|Kylmä joki kopio by Kaappo|
from Shutter speed 1/25 or slower
|WR_2.8_13 copy copy by photoprof|