Apple has an article on how to clean these keyboards: https://support.apple.com/en-ca/HT205662 https://support.apple.com/en-ca/HT205662 I've personally found t

Apple has an article on how to clean these keyboards: https://support.apple.com/en-ca/HT205662 https://support.apple.com/en-ca/HT205662 I've personally found that the steps work pretty well, and also if you have a vacuum with a brushed attachment on a lower setting may help if compressed air doesn't do it. You could also bring it in to the apple store and they could attempt to clean it for you!