Canon EOS R50 Mirrorless Camera (White) - Manual (Page 28)

Smudges on the image sensor
You can use a commercially available blower to remove dust or debris on the image
sensor that appears in images.
Besides dust entering the camera from outside, in rare cases, lubricant from the
camera's internal parts may adhere to the front of the sensor.
If smudges are visible on images, have the sensor cleaned by a nearest Canon Service
Center.
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