As scary as this sounds, clean it out with Simple Green and your garden hose first, to get the gunk out....you'll need to rotate the workings as you go to get all the innards spiffy.
Also clean all the other electrical connections to it, back to their origins.
Water itself doesn't kill them...its typically the gunk that gums up the brushes.
Once its rinsed out, run it a bit to let it dry....then, spray the Si into every nook and cranny...rotating the innards as you go...and also the wires to ground, and back to the rest of the electrical system, distributor, plugs, etc.
If its any reassurance, the things are designd to run in the rain, etc...and be splashed by puddles, etc...just not dragged kicking and screaming through nasty bog water, etc.
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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif