You can pop that key out, if it's one that you can do that too, or you can completely detail your old keyboard, I've done this one with mine before, it takes time and you need to keep a pic of where all the keys go, but just take a screwdriver and pop all the keys off, you have to apply some force to get them off, but you wont break it, clean them all & clean the board itself with all the keys off, then just re-assemble, good as new.