Update:
Just went out, plugged my ss switch in and got nice hot spark. Put the plugs in and it fired up.
I don't want to be pessimistic but experience tells me that within 2 minutes of hitting salt, you'll be back to square one again. When my switch was acting up, I would tinker with everything for 10-15 minutes with no luck and then she cranked right up. Wheeled it down to the surf, put the beach cart up, and no spark again.
Might try putting some salt water in a bucket and submerge the switch in that for a minute or two. Then push all the buttons a couple times and try to crank it...if you still have spark, then that's one point of failure that has been eliminated. I know my waterbox melted the ss switch wires on the lake. It would certainly cause problems in the surf.
edit: One thing I just picked up on was "plugged in my switch". If you're using plugs, better smear that crap with dielectric grease real good!