I found that when my D70 was that dirty, I had to do it more than that. I finally resorted to using canned air, couple of good shots with the camera held straight up, stop when the can gets cold, let the shutter down, spray out the entire chamber, wipe the sides out with a pec pad a couple of time. spray the chamber again. open the shutter again, spray it again straight up, two quick but full shots. then I'd go and clean the sensor directly again a couple of times, and it was finally clean.
It's not just the sensor that gets dirty, it's your camera too.
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