Yeah, Amey01 has a good idea--that's usually how I clean the backs of my Sequels. For the fronts (where it's easier to get to the surface) I usually use the little attachment for our Dyson (they call it a "stair attachment") that has the velour-like surface--that way I don't have to worry about the plastic end of the hose scratching my panels, or otherwise messing up the finish...
But I'd stay away from anything with bristles. That mylar is very strong against stretching, but relatively weak when it comes to things poking straight into it, even things as small and "soft" as the bristles on a vacuum brush.
--Richard