Canon Model 7S - Manual (Page 11)

Cleaning of the Camera
When you use your camera on a rainy day, or
at the beach, moisture and salt air adhere to it,
which can result in stains, rust, and corrosion.
Use a soft brush to rid the body of dust and
a dry, soft cloth for wiping.
Cleaning of the Lens
Use a blower with a rubbur ball to blow away dust
on the lens or brush lightly with a brush. Do
not touch the lens. If you should inadvertently get
a finger print on your lens, follow this procedure :
use a little pure alcohol or ether, if available, on
special lens tissue. Then wrap the tissue around
a wooden matchstick and wipe the lens in a cir­
cular motion. . . lightly and systematically.
• In extremely cold areas, expose the camera to
the outer air only when in use. Put it back im­
mediately after use. When using, expose the
camera gradually to the outer air to prevent
the lens from clouding.