As for me-I do it myself. Lenspen for sensors
http://www.lenspen.com/ does the trick. But if the dust does not affect 95 per sent of your images - don't bother, no matter how you try - the it always will be there. That's DSLR pay for interchangeable optics. 5 percent of images can be fixed easily in any good photo management program (I use Lightroom). Since dust is most seen against plain blue of clear sky - that's very easy fix.