re: re: Why don't NASA's $800 million Mars Rovers have solar panel cleaners?
If it was me, I'd just have a roller of clear, Saran-wrap type plastic stretched over the panels with a takeup roller on the other side. Every so often, run the dirty stuff off the takeup roller and clean stuff comes off the feed roller. Kind of like public restroom towel machines. If it jams, you're stuck with one surface, but that makes you no worse off than no roller sheets at all.
The design problem, of course, is the complex folding pattern of the existing solar panel design, which would make this concept hard to arrange. A rectangular pattern would work better, but probably not fold up right.