Apple iMac (21.5 and 27-inch, Late 2009) - Manual (Page 67)

Chapter 5 Last, but Not Least 67
Using the optical drive The SuperDrive in your iMac supports standard 12 cm
(4.7 inch) discs. Irregularly shaped discs or discs smaller than 12 cm (4.7 inches) are
not supported.
Storing your iMac If you are going to store your iMac for an extended period of time,
keep it in a cool location (ideally, 71° F or 22° C).
Cleaning Your iMac
Follow these guidelines when cleaning the outside of your iMac and its components:
 Shut down your iMac and disconnect all cables.
 Use a damp, soft, lint-free cloth to clean the exterior of your iMac. Avoid getting
moisture in any openings. Do not spray liquid directly on your iMac.
 Don’t use aerosol sprays, solvents, or abrasives.
Cleaning Your iMac Display
Use the cloth that came with your iMac to clean the display.
To clean your iMac display, do the following:
 Shut down your iMac and disconnect all cables.
 Dampen the cloth that came with your iMac—or another clean, soft, lint-free cloth—
with water only, and then wipe the screen. Do not spray liquid directly on the screen.