Before you go out and buy a new keyboard, if you can't get it to work, throw it in the dishwasher and run it through a cycle. When finished, let it dry completely....maybe a couple days, unless you can use compressed air to blow all the water out.
Should be like new.... I worked in IT [for a while] and we ran all our shop floor computers through a commercial dishwasher to remove oil and dirt from everything...keyboards, monitors and the computer itself. As long as you don't plug it into electricity wet, no harm.
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