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 favourite 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