QHYCCD QHY8L - Manual (Page 11)

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Clean the surface of CCD chip
If dust coats the surface of the CCD-it will impact
the your images and possible create “dust donuts”
and other artifacts.
If there is only a small amount of dust, we suggest
just using flat fields calibration to remove them.
You can open the front cover of CCD to clean the
surface of chip. You don't have to open the front
cover of CCD( this can be delete because ccd front
cover can not be open)
Screw the front cover of CCD counterclockwise,
and clean the dust off of the surface of CCD with a
manual air pump. If there is dirt that doesn’t come
off with the air pump, you can use lens paper or a
commercially available SLR camera cleaning kit.
Here is the correct procedure to follow with the lens
paper:
1. Wash your hands with soap.
2. Take a piece of lens paper,
and fold it once or twice
(do not fold too many times as
the lens paper will get very
sharp and the edges may
scratch the CCD glass surface)
Cleaning tips
3. Blow at CCD in a breath and use lens paper to
clean the CCD surface. Make sure to maintain an
appropriate pressure for CCD with your hand.
4. Finish cleaning and reinstall the front cover of
CCD. If there is higher relative humidity in your
environment- it is necessary to dry the inside of the
CCD sealed chamber.