Nikon D750 DSLR Camera (Body Only) - Manual (Page 478)

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Image Sensor Cleaning
Using camera controls during startup interrupts image sensor
cleaning. Image sensor cleaning may not be performed at startup if
the flash is charging.
Cleaning is performed by vibrating the low-pass filter. If dust can not
be fully removed using the options in the Clean image sensor menu,
clean the image sensor manually ( 0 451) or consult a Nikon-
authorized service representative.
If image sensor cleaning is performed several times in succession,
image sensor cleaning may be temporarily disabled to protect the
camera’s internal circuitry.
Cleaning can be performed again after a
short wait.