I get one of those spray bottles and fill it up with hot water. Open up the sprayer so its a mist. Spray it like 10inches away once water is dripping from the reel. Just do a wrist whip. Do that on all sides and wipe it down with a clothe. I don't use a hose because you don't want to push the salt inside the reel. The water needs to be at least warm so it can break down the salt. I always leave a sprayer in my car. By the end of the day the water inside the botltle is warm enough.
For my bait casters, calcutta and curado, I will do the above then I will take a couple of qtips and go through the eye wear the line pass, lol don't know what its called. Then I would open up the left side of the reel to remove the spool. Run the edges of spool and where the spool sits. I don't use any chemicals there because shimano supposely perfectly spaced the spool even a lil oil or grease will effect the free spool. I do run a lil reelx on some of the metal parts on the outside. Oh also take the qtip to line guide track too and put a lil lub like reelx or factory lube. One year maintainace or complete dunk is totatlly different and refer to alan tani website