The dust on the sensor, if it doesn't move between frames, is probably stuck.
Remember that there is a shutter moving at rapid speed, moving the air near the sensor and causing strong vibration.
If it looks like a blob a blower will not remove it. The biggest problem is oily dust which leaves blob shaped residue on the imager filter. This can only be removed with a physical cleaning, best done by a professional.
How does dust get there in the first place? If you never change your lens you will still get dist. Some of it comes from within the camera due to wear but most comes from outside. Your lens is an air pump. WHen you zoom or focus air, and the dust in it, is drawn into the lens. This is attracted to the sensor due to the sensors charge. So if this is how most dust gets into your camera you have to address how the dust gets onto your lens.
The main culprit is your camera bag. Put your bag in a strong afternoon shaft of light and give it a bang (without cameras in it). If you see dust particles coming out of it replace it. You can try to clean it but this probably won't help. The foam padding in the bag starts to break down after a while which generates dust.
I saw this first hand, a customer bought a Canon EOS-1Ds Mark III (early in the morning) for $8000, brought it home, put it in his camera bag and went out shooting. He came back that afternoon with complaining of dust on his sensor. It all came from the bag. The store sold him a new bag and cleaned his cameras and lenses and the problem went away.
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78 Z1R, '08 ZX10R, 2010 BC Roadster S/T, 6M, Stillen G2 CAI, Invidia CBE, Berk test pipes, Painted headlights (180˚Custom), JDM rear fog, B&M short shifter, Stillen front plate mount, stubby antenna, setrab oil cooler, uprev. 337rwhp 254ft/lb corrected!
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