Apple MacBook (13-inch, Late 2009) - Manual (Page 73)

Chapter 5 Last, but Not Least 73
Storing your MacBook If you are going to store your MacBook for an extended
period of time, keep it in a cool location (ideally, 71° F or 22° C) and discharge the
battery to approximately 50 percent. To maintain the capacity of the battery, recharge
the battery to 50 percent every six months or so.
Cleaning your MacBook When cleaning the outside of your MacBook and its
components, first shut down your MacBook and unplug the power adapter. Then use a
damp, soft, lint-free cloth to clean the computer’s exterior. Avoid getting moisture in
any openings. Do not spray liquid directly on the computer. Do not use aerosol sprays,
solvents, or abrasives that might damage the finish.
Cleaning the MacBook screen To clean the MacBook screen, first shut down your
MacBook and unplug the power adapter. Then dampen a clean cloth with just water
and wipe the screen. Do not spray liquid directly on the screen.