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A CCD clean is: a functionality test, blow out and clean of the mirror box area and the shutter area, then wet swab the sensor/filter. Test images are taken to check the clean. Externally clean the camera and the lens. Firmware up-graded if available.
A clean and service: a full functionality test, dismantle the camera and clean the mechanism internally, re-lubricate and make adjustments as required. Replacement of parts if worn or failing. Battery contacts, hot shoe and the body/lens connection pins are cleaned. After the unit is reassembled the sensor/filter is cleaned. Firmware up-graded if available.