Canon 40D - Manual (Page 129)

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Normally, the Self Cleaning Sensor Unit will eliminate most of the dust
visible on captured images. However, in case visible dust still remains,
you can append the Dust Delete Data to the image to later erase the
dust spots. The Dust Delete Data is used by Digital Photo Professional
(provided software) 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 [2] tab, select [Dust
Delete Data], then press <0>.
2
Select [OK].
Turn the <5> dial to select [OK],
then press <0>. After the automatic
sensor cleaning ends, a message will
appear.
3 Appending Dust Delete DataN
Preparation
Obtain the Dust Delete Data