Canon EOS Rebel T3i 18-55mm IS II Lens Kit - Manual (Page 187)

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Dust which could not be removed by the automatic sensor cleaning can
be removed manually with a blower, etc.
The surface of the image sensor is extremely delicate. If the
sensor needs to be cleaned directly, having it done by a Canon
Service Center is recommended.
Before cleaning the sensor, detach the lens from the camera.
1
Select [Sensor cleaning].
Under the [6] tab, select [Sensor
cleaning], then press <
0>.
2
Select [Clean manually].
Select [Clean manually], then press
<
0>.
3
Select [OK].
Select [OK], then press < 0>.
X In a moment, the reflex mirror will
lockup and the shutter will open.
4
Clean the sensor.
5
End the cleaning.
Set the power switch to <2>.
3 Manual Sensor CleaningN
For the power source, using AC Adapter Kit ACK-E8 (sold separately) is
recommended.
If you use a battery, make sure it is fully recharged. If the battery grip with
size-AA/LR6 batteries is attached, manual sensor cleaning will not be
possible.
COP
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