That's right....don't use that canned air. It does have something in there that can get sticky.
Also, you might just be pushing the dust into other places inside the camera.
What I use, is a bulb blower. Turn the camera front down, set it on clean mode and just puff the dust off of the sensor.
If the dust is stuck on there...then you need sensor cleaning pads (or similar). It's a fairly involved process but seems pretty easy.
Do a search, this has been talked about before.