Laptop keyboards are often the first thing to go. Pets, coffee, coca-cola... you name it. Replacing them can be quite easy and cheap depending on the make and model. A quick google or ebay search will usually turn up the keyboard you need, and buying that is often a good step toward figuring out what hidden screws might be holding it in place. If any. This video is concentrating on the Toshiba S50t, but many are very similar.