Can't completely clean the rear of my Volt - advice?

First, get the area clean (use clay bar or whatever it takes) and apply a good wax. This will make it easier to clean next time.
Then, after every drive (this is what I do) raise the hatch and blow the dust out of the inside corners. Then with some glass cleaner and a soft rag clean the back window (the small one). If there is any dirt/dust on the painted areas on the back of the car, use some 'quick detailer' spray and microfiber cloth to remove that.

The whole process only takes a minute or two. It keeps the car looking like new as long as the rest of it doesn't get dirty. And if it rains postpone the trip or take your other car

Bammerman said:

What if I applied Rain-X to the entire rear of the car (not just the lower rear window) -- Any reason not to try that? Might that not help to repel some of the dirt?

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Use a good wax on the painted areas. Rain-X is OK for the glass but not the paint. I recommend Turtle Wax ICE liquid wax. Easy to apply (use a SMALL amount, a little goes a long way), easy to remove. I would claybar the area first if it needs it for best results.