Samsung SyncMaster 2220LM User Manual page 7

Use the recommended detergent with a smooth cloth.
If the connector between the plug and the pin is dusty or dirty, clean it
properly using 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
interior cleaning once a year.
Others
Do not remove the cover (or back).
This may cause damage, electric shock or fire.
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A dirty connector may cause electric shock or fire.
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Otherwise, this may cause electric shock or fire.
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Do not use any chemicals such as wax, benzene, alcohol, thinners,
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insecticide, air freshener, lubricant or detergent.
the SAMSUNG customer care center
Keep the product's interior clean. Dust which has accumulated in the
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interior over an extended period of time may cause a malfunction or fire.
or Customer Center for