Apparently they are even dirtier than the average toilet seat. You need compressed air, a small brush, and perhaps a paperclip to get the dirt out, then an anti-bacterial wipe/spray to clean it.
I just clean my keyboard the old fashion way. You simple just pop all the keys out and have your wipes ready. Then you just clean and get all the grime out of the keyboard. I don't have the time or money to get a compressed air just for a keyboard. If it ever gets to that point I will just sacrifice the $10 for another keyboard.
I purchased a jar of Cyber Clean keyboard cleaner to take care of my dirty keyboard. It's great for picking up the crumbs that work themselves in between the keys.
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