Samsung SyncMaster 720N Owner's Manual page 6

Use the recommended detergent with a smooth cloth.
If the connector between the plug and the pin is dusty or dirty, clean it
properly with a dry cloth.
Make sure to unplug the power cord before cleaning the product.
Unplug the power cord from the power outlet and wipe the product using
a soft, dry cloth.
Contact the
once a year.
Others
Do not remove cover (or back).
If your monitor does not operate normally - in particular, if there are any
unusual sounds or smells coming from it - unplug it immediately and
contact an authorized dealer or
Keep the product away from places exposed to oil, smoke or moisture;
do not install inside a vehicle.
A dirty connector may cause an electric shock or fire.
Otherwise, this may cause electric shock or fire.
Do not use any chemicals such as wax, benzene, alcohol, thinners,
insecticide, air freshener, lubricant or detergent.
Service Center
Keep the product's interior clean. Dust which has accumulated in the
interior over an extended period of time may cause malfunction or fire.
This may cause an electric shock or fire.
Refer servicing to qualified service personnel.
This may cause an electric shock or fire.
This may cause malfunction, an electric shock or fire.
Especially avoid operating the monitor near water or outdoors where the
monitor could be exposed to snow or rain.
or Customer Center for interior cleaning
service.