On SHIMANO's HP we can see the video to introduce how to care spinning reels after using in the salt water and brackish water.
http://tv.shimano.co.jp/movie/beginners/013?_ga=1.188557679.632737712.1390791393
< STEP 1 > - Just after fishing
◎ Close the Drag knob to avoid the water intruding inside the Drag.
◎ Wash up the reel by fresh water with shower.
◎ Wash well especilly around the Spool and Line-Roller.
◎ After washing, shake the reel well and rotate the handle to get out the water on reel.
◎ Wipe out the reel with a dry towel.
XXX The action we cannot do for reels XXX
X Drop the reel to the water to wash.
X Leave the reel to keep the fishing line on Line-Roller.
X Leave the reel to keep on fishing rod.
X Wash by warm or hot water.
< STEP 2 > - After coming home
◎ Loose the drag knob and open the oil-injecton hole of the reel.
◎ Leave the reel in the place without sunshine to dry up well.
XXX The action we cannot do for reels XXXX
X Leave the reel in the box or bag.
X Dry up by hair drier or sunshine.
< STEP 3 > - Finishing
◎ Put on the oil and grease along the user manual of the reel.
◎ Put oil on oil-injection hole 1 time for 5 time's fishing or 1 time for 1 month.
◎ Spray the oil within 1 second.
【Product information - SHIMANO XARS REEL OIL SPRAY 】
This oil can make the rotation performance of reels increase by 25% comparing with other oil of SHIMANO.
Also the ability of anti-rust is very good.