The 30D seems to generate/attract dust far more than the 10D. Maybe that's because of the different shutter mechanism or a higher charge on the sensor - I don't know.
I use the Copperhill method if necessary, but 90% of the time a brush works fine, and is much easier. I can recommend the Daler-Rowney SY21 System 3 brushes which have long and very fine nylon hairs. You may get these from a local art shop, but otherwise try somewhere like
Jims, Cornwall UK - Artist Equipment and Fishing Tackle Online.
IMO there's no need to spend silly money on some of the hyped-up sensor cleaning brushes. They're just fine nylon like this one, but cost ten times as much.