Microsoft Xbox Repair Manual page 79

You can now safely remove all the buttons and rubber cups they sit in.
I gave all the buttons and D-pad a nice bath in warm soapy water. If the board has become
drenched with your favorite soda or whatever use some mild soapy water on a rag to clean it up,
stay away from window cleaner and other harsh cleaners. Yes, you can put soapy water onto a
board and it does not burst into flames or anything, just don't soak it and try to stay away from
components as much as possible. The most important thing is to let it dry COMPLETELY before
attempting to use it.
Look at the controller while it's all apart, the rubber pads act as a little cup to contain any drips of
liquid, the controller sticks act like little umbrellas to keep the important pieces underneath clean
and each of the buttons are keyed so they can only go back into the controller the right way.
Once the buttons are all nice clean and dry, get the top cover out and start putting the buttons back
in place.
Now put the rubber cups in place, these are keyed as well and only fit properly one way.
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