Great caution should be used when clean your own keyboard. Liquids can damage the laptop and water damage is not covered under the Apple warranty. Replacement laptop keyboards can cost as much as USD $650.00.
How to clean a keyboard
Disinfectant wipes can be used to clean the keyboard surface. Carefully squeeze out all liquid from the wipe before using it. Be gentle with the keys by pressing lightly. Always ensure the disinfectant wipes don't contain bleach as this will remove the lettering on the keyboard.
Electronics cleaner and a microfiber cloth can also be used. You can make your cleaning solution, using equal parts water and rubbing alcohol.
Remember, do not spray liquid directly onto the keyboard (apply to a lint-free, microfiber cloth, instead). Then wipe the keyboard.
Liquids are not a friend to your keyboard. The last thing you want to do is damage your keyboard while you're trying to clean it. Less is more when it comes to using a cleaning solution.