Wow, that's really stupid!
I wouldn't be so critical, except that you present yourself as an authority. You should cease doing so!
I recommend that you do a search on RTGs and find out what they are and what they do.
Also, what material are you trying to keep from freezing (ala your fuel cell digression).
Much as I love Marcia, there are strong reasons to suspect that electrostatic forces are attracting the dust to the cells. Dumping, or even exposure to Mars' low-density wind is not likely to knock the dust off, if it is sticking to the surface.
The "multiplanetary species" stuff is hilarious! Thanks for the laugh.