I've found a combination of regular dry sensor cleaning with a bulb blower and an occasional wet cleaning with pec pads and eclipse work great on both my 1D and 5D.
Another key is how careful, quick and systematic I need to be when swapping lenses. As soon as I get sloppy I find shit constantly.
Ed, take a picture of a plain white background at smallest aperture possible, focused to infinity. All the dusties on your sensor will show up clearly.
And nice shots!
Alex
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