FujiFilm GFX 100II Owner's Manual page 466

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