Yea... I can sympathize lol as I'm coastal, sometimes in
the ocean depending on lunar tide/storm surge >.<
You've got the idea, wax or lube what ya can... other'n that the ocean really does win every time, covers don't do a lot of good TBH as they can't shield from the salty, moist air, but they do save ya from the seagull love *shrug* Washing it all the time is your best bet... but there is also this product;
CorrosionX Aviation, 16 oz. aerosol (80102)
Which, while a touch spendy is simply wonderful for protecting those hard to reach places, corners, inside of tubes, dissimilar metals or w/e else ya don't wanna or can't wax/lube. It's mostly used in aviation and it does work really well with only occasional retreatment, depending on conditions.