After every fishing trip it is wise to do basic maintenance. Clean your reel with a soft cloth and remove sand, dust and other dirt without pushing hard. Eventually you can rinse your reel with cold fresh tap water, but do not sub-merge the reel under water.
Special attention when the reel is used in salt-water condition. In this case always clean the reel with cold water and rinse. Salt is an aggressive material that can destroy your valuable fishing tackle by not cleaning well after use. For these fisherman we even advise to remove the fishing line every now and than when the reel is used in salt water. This to avoid that salt can crystallise between your fishing line and spool, because this can be a cause of corrosion.
Always use sparely a drop of oil on metal to metal moving parts.