Canon EOS Rebel T3 18-55mm IS II Lens Kit - Manual (Page 171)

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Dust entering the camera can adhere to the image sensor and cause
dust spots to be visible on the captured images. To erase these dust
spots, you can append the Dust Delete Data to the images. The Dust
Delete Data is used by Digital Photo Professional (provided software,
p.270) to erase the dust spots automatically.
Get a solid-white object (paper, etc.).
Set the lens focal length to 50mm or longer.
Set the lens focus mode switch to <MF> and set the focus to infinity
(
∞). If the lens has no distance scale, look at the front of the lens and
turn the focusing ring clockwise all the way.
1
Select [Dust Delete Data].
Under the [y] tab, select [Dust
Delete Data], then press <
0>.
2
Select [OK].
Select [OK], then press < 0>.
Instructions will appear.
3 Appending Dust Delete DataN
Preparation
Obtain the Dust Delete Data
COP
Y