|"I can't just buy a new keyboard,"|
Actually it most likely is a single part. You'd have to remove it from the laptop. Some get kind of tricky to take apart. See the company that made it for their web site. Might have how to disassemble.
Once the keyboard is removed you might take distilled warm water and try to douse it to clean it. Then dry with shop vac blowing side air.
If fails after cleaning see about buying one.
After all that work you might be better off giving it to a re-sale or goodwill shop and buy a new one. Take the tax credit.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, are in my top 10