It should work, probably better than the loupe. The kind of dust Squidy is talking about might be hard to see even that way. From what he described they probably did a wet clean and pushed the dust to the side. Particles break down with the moisture and are harder to see. One of my 5D II's was real nasty when I bought it new. I went through a box of swabs before I got all the dust off the edges, and you couldn't even see it with the loupe.

It makes a good point, if you are cleaning a sensor you should use the blower as much as possible. Most methods other than the blower have the chance of making large particles into smaller ones.