Subal alarms are well known for not shutting off even when dried. The problem is some moisture is sucked up into the small rubber boot and even when dried, crystalized salt water will carry enough current to activate the alarm for days on end.
Here is my solution to this problem.
1. Gently pry the two prong contact head off the housing. No need to remove the circuit board.
2. Carefully cut through just the rubber prong boot and pull it off the head.
3. Brush off the contact head until you can insert the battery with out activating the alarm.
4. Test functionality by shorting prongs with wet finger.
5. If good, cover the head with heat shrink tubing, or if in the field several wraps of tape will work.
6. Glue or temporarily tape prong head in original location. A temporary thin shim will help keep the prongs close to, but off the housing body.
I used clear silicone glue for this when I got home.
