Canon EOS R3 Advanced User's Manual page 900

4.
End the cleaning.
Set the power switch to <
Note
Using the household power outlet accessories (sold separately) is recommended.
Caution
While cleaning the sensor, never do any of the following. If the power is cut
off, the shutter will close. These may result in damaging the image sensor
and shutter curtains.
• Setting the power switch to <
• Removing or inserting the battery.
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 turned off, the shutter will close and the shutter curtains may get damaged.
Never use pressurized air or gas to clean the sensor. Pressurized air may damage
the sensor, and sprayed gas may freeze on the sensor and scratch it.
If the battery level becomes low while cleaning the sensor, the beeper will sound as
a warning. Stop cleaning the sensor.
If a smudge that cannot be removed with a blower remains, having the sensor
cleaned by a Canon Service Center is recommended.
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