We have a winner! Finally, the real deal.
Rinsing can cause more harm than good.
If I have a reel in salt water environment I would tear it down immediately after using it, and use a product called Salt Away to chemically neutralize the salt. Just keep a glass jar of it on your workbench and as you tear the reel down, toss relevant parts into the salt away, rinse, dry the parts thoroughly & re-grease or lube parts and put reel back together again. Otherwise, what happened above will happen again over and over.
In fact, reel manufacturers are counting on it! Some intentionally use materials they KNOW will corrode with salt contact. Reel manufacturers love to hear stories like this one- so you go buy another reel from them, or pay them as much to fix it as another reel might cost. It is called built-in obsolescence.
I would not let reels go for any length of time without some sort of servicing. Gotta protect the investment. So for me, any salt water use demands immediate servicing no if's, and's, or but's about it.
For my rods, salt is extremely corrosive to some guides. So I take a small paint brush and brush salt away all over the guides, let it stay there per instructions for the time it takes to neutralize salts, then rinse. And, to prevent any corrosion, I will often wipe the guides with corrosion X and put the rod away, and wipe it off before next fishing trip.
My rods and reels will be ready come next use. Will not have any surprises if I follow some basic ground rules.
Information on salt away from their website:
Salt-Away is a water-based, non-hazardous, biodegradable solution and contains properties that dissolve, release and remove salt crystals from any surface. WATER ALONE WILL NOT REMOVE SALT. Use of Salt-Away will not correct past damage but will work to protect against salt corrosion and reduces costly repairs caused by salt. Salt-Away breaks apart and removes salt accumulation with repeated use.
Salt-Away can safely be used on all metals, fiberglass, paint, rubber, plastic, chrome, glass, concrete, brick or any surface exposed to salt. Salt-Away, mixed with water, washes away the salt then leaves a protective film on surfaces until surfaces are again exposed to water or salt. Special high-performing corrosion inhibitors in the product help protect metals from corroding if not rinsed off. Salt-Away will not strip wax or cause streaks or spots. It is easy to apply by using pressure or power washers, Salt-Away's special Mixing Unit, the ready-to-use spray bottles for smaller jobs, and by immersing items into a mixture of Salt-Away and water.