Get yourself a couple of cans of water dispersant and go nuts on your electrics and areas that are hard to get at to rinse, this will really help with all the salt damage and electrical shorts. Make sure you get everything clean an dry and then give things a couple of coats of spray, you can't use too much and it is worth pulling apart major plugs and spraying them inside as well.
As for all your joints, grease them well as sand is a killer on bushings, use a marine grade grease for this as it won't be affected by water or salt creep (worth cleaning out the old grease as much as possible first).
And the biggest thing, accept now that the car is going to get completely f@#k unless you spend ridiculous amounts of time cleaning and caring for it