How should I maintain the carbon monoxide alarm and how often?

The alarm must be kept clean and maintained once a month. Use a vacuum cleaner to remove visible dust, then wipe the surface with a lightly damp cloth (not dripping wet), and check the batteries for leakage or rusting. Do not clean the alarm with chemicals such as alcohol, petrol, or cleaning agents, as these can damage it. After cleaning, always test the alarm using the TEST button and only reinstall it if it passes the test.