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I used to work in an IT training center. Our classroom keyboards would get nasty. We would wash them in the top rack of the dishwasher. It works, but modern keyboards are basically just a few layers of crude, thin circuit board layered together. It takes a long time for the water to dry out from between those layers. We used to open them up using a power screw driver and give them a quick wipe out. It only took about a minute.