Cleaning the Image Sensor
Dust that cannot be removed using D [USER SETTING] > [SENSOR CLEANING] can be removed manually as described below.
Note that there will be a charge to repair or replace the image sensor if it is damaged during cleaning.
Use a blower (not a brush) to remove dust from the sensor.
Do not use a brush or blower brush. Failure to observe this precaution could damage the sensor.
Check whether the dust has been successfully removed. Repeat Steps 1 and 2 as necessary.
Replace the body cap or lens.