In the five years of owning DSLRs (all Canons) I've never found dust to be anything but a minor problem. Far less of a problem that when I run my own darkroom.
My method of cleaning is the Pec-Pad/ Eclipse route. Simple, effective and takes just a couple of minutes. I have 3 DSLRs, all used very frequently with continuous lens changing. This year I have cleaned the sensor on two of them.
As for the blower method, well I tried it once and finished up with a bit of dirt in the viewfinder of my 300D, This happened at about the same time that Sue (Greypoint) had a similar experience. Have not used a blower since
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