...ok, based on a tiny island ,i get salt all over...all the time, plz note:
Wd40? Only with a cue tip, to cleand around and inside metal bolts/screws NEVER SPRAY
Also a BIG NOPE on Canned air, canned isopropyl alcohol, or any stuff CANNED, will FREEZE all plastic and metal, and will destroy plastic and parts as they loose flexibility and elasticity, they may brake the part on your hand, belive me...I'm already witness how canned isopropyl alcohol freeze an old Phantom letting me with crumble plastic and a pile of rubbish.
DO NOT FREEZE your drone by canned air/alcohol etc...
soft rug and silicone will protect plastic and cover metal parts as well.
Avoid sand and dirt on take off and landing, carry a land strip, better if yellow or white, to see departure point from sky high, and avoid wondering when in trouble, dive and land into strip.
regular inspection must be part of the after landing/home task.