Canon EOS 60D - Manual (Page 234)

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3 Manual Sensor CleaningN
While cleaning the sensor, never do any of the following. Doing any
of the following will cut off the power and close the shutter. The
shutter curtains and image sensor might get damaged.
• Setting the power switch to <2>.
• Opening the battery compartment cover.
• Opening the card slot cover.
The surface of the image sensor is extremely delicate. Clean the sensor
with care.
Use a plain blower without any brush attached. A brush can scratch the
sensor.
Do not insert the blower tip inside the camera beyond the lens mount. If
the power is cut off, the shutter will close and the shutter curtains or
reflex mirror might get damaged.
Never use canned air or gas to clean the sensor. The blowing force can
damage the sensor or the spray gas can freeze on the sensor.
If a smudge that cannot be removed with a blower remains, having the
sensor cleaned by a Canon Service Center is recommended.