I presume you must have a laptop as a replacement desktop keyboard is really inexpensive. So each key on most laptop keyboards have a silicone or rubber cap under each key cap with a conductive pad inside that bridges and connects some contact points on the keyboard circuit board, when you press a key. So anywhere on the keyboard circuit board residue from say a beverage spill can conduct at various points and cause all sorts of strange keyboard behavior. So you could start by popping the non functioning key cap off of the keyboard and cleaning that key with a cloth and some isopropyl alcohol and maybe get a tiny bit of alcohol into the rubber key cap. You could remove all the keys and keep them in the precise order and try cleaning all the keys. By the way if your computers is very old, popping off the key cap can sometimes break the plastic parts from the plastic being brittle so be real gingerly and try not to break or even remove the underlying plastic hinged parts under the key cap Also understand assembling keyboard plastic parts and latching them back if they come loose can be quite tedious. If nothing works you can simply order a replacement keyboard from eBay by using your make and model of computer and changing keyboards is usually an easy job with a few screws underneath that hold the keyboard and you could watch a tutorial on YouTube on how to change the keyboard or find a friend or family member who is handy or just get a shop to do it and it probably would not cost a whole lot.
Agree keyboard is done for, if you want to drink liquids while working on the computer get a water proof one, yes they really make them
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With kids I have dealt with this exact thing several times. I finally got wise and bought a cover for the last replacement keyboard I had to purchase. I got the one for my keyboard model at this website;http://www.smartkeyboardsolutions.com/ke... It seems like they carry covers for almost every model out there. Good luck.
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