Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 277)

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z When Multi Shot Noise Reduction is set, [Clean manually] cannot be
selected.
z While cleaning the sensor, never do any of the following. If the power is
cut off, the shutter will close and the shutter curtains and image sensor
may get damaged.
- Setting the power switch to < 2 >.
- Removing or inserting the battery.
z The surface of the image sensor is extremely delicate. Clean the sensor with
care.
z Use a plain blower without any brush attached. A brush can scratch the
sensor.
z 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 or reflex
mirror may get damaged.
z 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.
z If the battery level becomes low while cleaning the sensor, the beeper will
sound as a warning. Stop cleaning the sensor.
z If a smudge that cannot be removed with a blower remains, having the sensor
cleaned by a Canon Service Center is recommended.