Well I have been fighting dust with the ZD digital back and there is no easy solution.
To be honest cleaning my 5D was not easier but more effective.
When they delivered the back to me it was horrible, both backs had enourmous ammounts of dust.
I started with eclipse on the sensor and cleaned the IR cutfilter with pecpads but later also switched to eclipse.
It took me about an hour to get the whole system 95% clean which is more than enough.
The biggest problem is that the IR cut filter is removed from the sensor so while you are cleaning the filter the sensor can get dust again.
Finally I decided to clean the sensor first and lay it face down on a pecpad, now cleaning the cutfilter with eclipse and pecpads.
And as quickly as possible assemble the unit.
The unit is now as mentioned 95% clean so don't think to easy
To be honest looking back, it's MUCH easier than the DSLR, but remember that the whole unit is exposed to the air and not protected by the body/chamber of the DSLR.
So don't move to much air while working.
By the way, when the first batch of dust is gone, maintance is VERY easy, but the first series seems to be VERY sticky on my backs.
Now that they are clean they keep clean very easily with the blower and the brushoff pencil.