I only use Salt Water Rated reels in the salt. I carry a gallon jug of water with me on salt water outings to 1st rinse the reel by pouring some fresh water on them, then they go in a Tupperware container submerged with the rest of the fresh water for an overnight soaking. I then take the spool off and rinse all parts thoroughly with fresh running water the next day.

Salt water and air will corrode the fresh water gear in pretty short order; especially if they are left to dry rather than immediately flushed with fresh water.