Did you spill something on it or are you just not liking that "new keyboard smell?"
If you spilled something on it that is now reeking, then you should take off the keys and clean them individually and use a mild cleaner on a damp cloth to clean the underlying silicone button mechanism.
Getting rid of the "new keyboard" smell will take time for the plastic to out-gas, but in the meantime you could lay a dryer sheet on top of the keyboard overnight (don't close your laptop) It could work