Always fresh water rinse my reel after using in salt water.
Always clean and re-lube reels after some extended outing, just like I would my shotgun after a hunting trip ... even if it never got fired.
Have been know to get my fresh water reels in the sand and in that case I give then a real good stream side rinse; then clean & re-lube back at camp.
(p.s.) must be helping some, got a couple of reels that are still in use after 40 years + of use.
Dale