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Use a cotton swab to clean your computer.
This description provides step-by-step instructions on how to use a cotton swab to clean your computer. First, turn off your computer and unplug it from the power source. Then, use a cotton swab to gently wipe away any dust or dirt from the exterior of the computer
From Wikipedia
Cotton swabs or cotton buds, also Q-tips, are wads of cotton wrapped around a short rod made of wood, rolled paper, or plastic. They are most commonly used for ear cleaning, although this is not recommended by physicians. Other uses for cotton swabs include first aid, cosmetics application, cleaning, infant care, and crafts. Some countries have banned the plastic-stemmed versions in favor of biodegradable alternatives over concerns about marine pollution.