On jobs such as this I use the "80 / 20" rule. I can make a job look 80% better in 20% of the time it would take to make it 100% better. Use a "dust magnet" (I use a california car duster, available at most auto supply stores) and simply go over the blinds once or twice in both the open and closed position. Most of the dust will be removed, takes about 2 minutes.

Call Testermans, really great job. Then you can probably keep up with it yourself.