Follow the steps and you'll be fine.
Here is what I do to my personal reels after each trip in salt water. I lightly rinse the reels with fresh water. I wipe the exterior with a towel. Then open the side plate that allows access to the spool and leave it open to let any excess water drain from the reel. I let it dry out over night and then I remove the spool from the frame. I then take some q-tips with rubbing alcohol and clean the spool lip, spool raceway on the frame and anywhere I see salt deposits. This seems to keep my reels free of any corrosion. I also make sure all the drain holes on the reel are free of obstructions to allow any water that migth enter the reel to exit.
I also tear the reels down after every few trips and inspect and/or service the reel. If the reel becomes submerged then it will need to be torn down that day and cleaned thoroughly to remove any salt deposits.
Here is what I do not
Soaking the reel in a bucket of water
Taking the reel in the shower with you (Don't laugh I have heard this several times)
Spraying the reel with WD40, Corrosion X or any other kind of oils. The oils will break the grease down from the gears and drag. I have repaired thousands of reels from your area and every reel that has been soaked in WD40 has been ruined. It causes the drag to become "jerky" and premature failure of the gears. It didn't really prevent any corrosion from taking place either...
Cleaning the reel with carb cleaner or Gasoline (obvious)
Submersing in fresh water to "rinse"
I have seen that the humid and salty environment lends itself to corrosion. Try if at all possible to bring the reels into a dry place for storage. I realize the climate can be humid in the summer months, but the reels will not loose the trapped moisture in your area.
Try this and let me know any other things that each of you have been doing