Due to the climatic conditions in South Africa, Digital SLR users often find themselves in need of a sensor blowout to remove those irritating dust particles that find their way into your DSLR and onto your camera’s sensor, resulting in spots appearing in your pictures. Your camera's sensor will need cleaning as part of routine maintenance to ensure that your images are captured perfectly. Normal use of your camera and changing lenses will allow dust ingress.
This sensor clean is only suitable for DSLR’s that are in a relatively clean condition, where you are experiencing problems with only a handful of spots appearing on your pics.