Canon EOS 80D - Manual (Page 407)

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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
recommended.
1
Select [Sensor cleaning].
 Under the [53] tab, select [Sensor
cleaning], then press <0>.
2
Select [Clean manually].
3
Select [OK].
 In a moment, the reflex mirror will
lockup and the shutter will open.
 “CLn” will blink on the LCD panel.
4
Clean the sensor.
5
End the cleaning.
 Set the power switch to <2>.
3
Manual Sensor CleaningN
 If you use a battery, make sure it is fully charged.
 If you use Battery Grip BG-E14 (sold separately) with AA/R6 batteries,
manual sensor cleaning will not be possible.
For the power source, using DC Coupler DR-E6 (sold separately) and AC
Adapter AC-E6N (sold separately) is recommended.