If it's simple water moisture it should clear up with just keeping the camera in a warm dry place for awhile. If it's something else, like chemical fogging (from electronics, lubricant, etc.) then there's probably little you can do short of an expensive cleaning (seldom worth if with a compact digicam).
Another possibility is fungus from longterm moisture fogging. If that's the case the lens is kaput.
Can you actually see it in the lens, or just in the pictures themselves?