Rocket blower is a good product but not the best for cleaning sensors.
Some of them seem to have a bit of the mold-release wax left inside. It can spall off and get blasted at high speed against your sensor where it'll stick like gaucamole to flannel. The more energetically you use this blower, the more likely you are to remove dust but end up with many more little waxy particles in their place. The darn thing's caused me all kinds of grief over the years when I didn't have any other options on hand. I try to only use it for cleaning external areas or anything BUT the sensor.
I've since purchased the Visible Dust Zeeion blower but have yet to put it to the test. I like that it actually filters the air coming in and leaving the bulb and uses a one-way-valve to maintain the cleanest airflow possible to the nozzle. Glad they built it cuz I was about to make something like it - but a lot less portable.
for wet-cleaning sensors on cameras I don't care much about, like the used Rebels I kick around for rough work, I dry clean with a blower and then have gotten away with using cotton swabs on the stickier particles followed by a wet cleaning. I've even used non-streak window cleaner on one that looked like someone had sneezed on it, cleaned it up good but I don't recommend you use these cheapskate wet-cleaning methods on cameras you spend a lot of money on. There are plenty of decent wet-clean products and systems out there.
To avoid cleaning in the first place, I buy a camera, put it on the back of a lens and leave it there, used consumer cameras are cheaper than lenses and often work well enough for most infrequent shoots to just leave them there.
They're optically functional dust-caps.
Oddly enough ..
I just replace it with one of those Nikon/Sony sensors
.. My nikons don't show dust shadows as bad as my canons - maybe the AA filter is a little farther away from the sensor so casts a less contrasty shadow?..