The salt will get everywhere. Even on a dry day the salt dust will get everywhere just like normal road dust does. Salt is hygroscopic so if you don't get every trace off (impossible) it will become damp and active. All the fasteners will lose their plating as will the brake rods and levers, the unprotected aluminium rear wheel adjustment blocks, the cast iron rear wheel spacers, the abs inductor discs, the front suspension joints...you get the picture?
We did this on our first spyder and it took a lot of rectifying...well, it never got back to original because Spyders just aren't built to cope with winter weather.
However, get down to the auto motor factors and buy yourself a few aerosol cans of under body wax treatment. Saturate everything with the exception of the brake discs - then give it another coat or two. It will still suffer a little but you can then get out winter riding and double your riding season. There's some beautiful days to be had during the winter and if you've got a heated seat too, all the better.