Did you clean them out yourself? There's very little room to use any sort of tool to clean under the keys without removing the caps, and from what I understand

Did you clean them out yourself? There's very little room to use any sort of tool to clean under the keys without removing the caps, and from what I understand pulling the caps is a fairly risky procedure no matter how delicate. You can get some way with canned air and something like a sheet of heavy paper to slip under the cap, but it's by no means infallible. My intended solution is to take it periodically to the Apple store and request htey clean it out, since they have replacement caps and presumably the service manual on how to remove them properly. If enough people waste enough of their time and money, it might encourage them towards less hostile designs in future.