"How about a salt bomb?
If you need dispersal, perhaps pump some salt water in a spray pattern.
Solar panels are used in the marine (salty) environment all the time so, the panels should not be negatively affected. "
"And how about this one( Arduino OSD):http://www.rcgroups.com/forums/showthread.php?t=1473207
Really cheap. Heck, Remzibi is not much more and that includes GPS and Prolific cable. And there is already lots of work done to integrate it into APM.…"