If we were dealing with fresh water immmersion your suggested approach would likely prove adequate. Unfortunately the salt water exposure provides that simply drying the PcB's will leave salt residue which will continue to attract moisture and promote corrosion. Only solution with a hope of success is to thoroughly clean everything.Open up and use compressed air at every angle and component accessible, unplug every thing you can get to, blow air on them and reconnect, then leave open under a fan for a day or so. Complete submersion in fresh water again may clog the tiny openings on the barometer chip. If all fails, you have maybe some replacement parts for your next one, you will get another, right? (hooked like me)
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