Apple products typically hold up well under normal use. However, even under normal use it is a good idea to clean them occasionally to ensure that they remain productive tools.
In particular, cleaning your MacBook Pros regularly is important because they get used in different environments that result in excessive wear and tear. Please be mindful of this as our MacBook Pros change hands often during a lease period.
Per Apple's support page on this topic, there are a number of guidelines to consider:-
Use only a soft, lint-free cloth. Avoid abrasive cloths, towels, paper towels, or similar items.
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Avoid excessive wiping, which might cause damage.
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Unplug all external power sources, devices, and cables.
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Keep liquids away from the product, unless otherwise noted for specific products.
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Don't get moisture into any openings.
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Don't use aerosol sprays, bleaches, or abrasives.
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Don't spray cleaners directly onto the item.