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Dust that could not be removed by the automatic sensor cleaning can
be removed manually with a commercially-available blower, etc. Before
cleaning the sensor, detach the lens from the camera.
The image sensor is extremely delicate. If the sensor needs to be
cleaned directly, having it done by a Canon Service Center is
Select [Sensor cleaning].
Under the  tab, select [Sensor
cleaning], then press <0>.
Select [Clean manually].
Select [Clean manually], then press
Select [OK], then press <0>.
In a moment, the reflex mirror will
lockup and the shutter will open.
“CLn” will blink on the LCD panel.
Clean the sensor.
End the cleaning.
Set the power switch to <2>.
3 Manual Sensor CleaningK
If you use a battery, make sure it is fully charged.
For the power source, using AC Adapter Kit ACK-E18 (sold separately) is