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A visible build-up of finger gunk on the flat surface and laser-etched numbers on most-used keys shows that it’s time to clean my keyboard. To do this I first use Simple Green All Purpose Cleaner at full strength, then a generic glass cleaner to remove the Simple Green residue, then 99% isopropyl alcohol to remove any remaining residue. Each is applied to a clean paper towel and used to carefully scrub both the keys and gaps between. Being one of the (excellent) modern, flat, metal-body Apple keyboards it’s particularly easy to clean, and after I’m done the keyboard feels like new.