Canon EOS 5D Mark III Instruction Manual (en)

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Whenever you set the power switch to <1> or <2>, the Self 
Cleaning Sensor Unit operates to automatically shake off the dust on 
the front of the sensor. Normally, you need not pay attention to this 
operation. However, you can choose to perform sensor cleaning at any 
time, or disable it.
1
Select [Sensor cleaning].
 
Under the [53] tab, select [Sensor 
cleaning
], then press <
0>.
2
Select [Clean nowf].
 
Select [Clean nowf], then press 
<
0>.
 
Select [OK] on the dialog screen, 
then press <
0>.
X
The screen will indicate that the 
sensor is being cleaned. Although 
there will be a shutter sound during 
the cleaning, a picture is not taken.
 
In step 2, select [Auto cleaningf] and set it to [Disable].
X
The sensor cleaning will no longer be executed when you set the 
power switch to <1> or <2>.
f Automatic Sensor Cleaning
Cleaning the Sensor Now
Disabling Automatic Sensor Cleaning
 
For best results, perform the sensor cleaning while the camera bottom is 
placed on a table or other flat surface.
 
Even if you repeat the sensor cleaning, the result will not improve much. 
Immediately after the sensor cleaning is finished, the [Clean nowf] 
option will remain disabled temporarily.