The sensor lies hidden behind the mirror in your camera, and can only be accessed with mirror lock-up mode, or when the shutter button has been clicked. You will need to remove your lens before performing a sensor cleaning.
This is the sensor outside of the camera.
-Sensor Swab that matches your sensor size. I use Vswabs by Visible Dust
-Sensor cleaning solution (I use Visible Dusts Sensor Clean Product)
-Sensor Loupe with sensor pen (not necessary, though very helpful!) I use this kit by SensorKlear
-Sensor Blower (Not necessary, but a great option for a real quick fix in the field)
Here's how you should do this:
