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I'm not convinced that using fluid wouldn't do damage at some point
It's not the fluid per se, but the necessary rather hard contact of the swab against the sensor and the possibility of scraping some microscopic bit of abrasive material (common in air in natural and industrial environments) across the sensor. It happens; it happened to me. The brush grabs the particles and requires extremely little pressure to be effective.
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I wonder if anyone will invent a CCD Sensor cleaning vacuum?
If you want a good laugh, you can search the forum for my invention(s). I tried all sorts of vacuuming related ideas in addition to the stuff I shared. No go, I'm afraid. The vacuum pulls in as much new dust as it's pushing out, unless you have a very good filtering system or you work in a clean room. Same problem with simply blowing air into the chamber; you're just moving dust from one place to another, but not getting rid of it within the camera chamber. Olympus' method of in camera ultrasonically shaking dust loose seems more viable and by various reports actually works. I haven't tested the D2X method of masking dust particles on the sensor by letting you save a picture of just the dust on the sensor and then the camera interpolates around the dust. I don't care for that one because you lose information with the interpolation and you could lose track of just how bad your sensor has gotten because you're letting dumb software get rid of dust spots for you, but at a cost.
For now, we have to deal with the contamination ourselves, with no help from Nikon or Canon.