I've washed many a keyboard and membrane in hot water, the key is letting the components dry thoroughly. This has been useful for laptop keyboards which are usually awfully expensive to replace. Of course, this has usually been after a spillage of some kind, whereby the keyboard is faulty. I'm not sure I'd be brave enough to risk a keyboard just because cosmetically it's a bit grimey...
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Tried and Tested
I've washed many a keyboard and membrane in hot water, the key is letting the components dry thoroughly. This has been useful for laptop keyboards which are usually awfully expensive to replace. Of course, this has usually been after a spillage of some kind, whereby the keyboard is faulty. I'm not sure I'd be brave enough to risk a keyboard just because cosmetically it's a bit grimey...