Apart from the Matrix, you will also need to clean the optics. In particular, you will need to clean the lens.
You need to remember the you will need to clean the lens more often and frequently. This is because it is easy for the dust and other dirt to stick to the lens and affects the quality of your images. This is particularly true if your are a frequent photo shooter.
Also, I would recommend you to purchase a towel specifically designed to clean the optics since using regular towels may damage the lens. Again: Do it gently and carefully as the lens is the weakest part of the camera.