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Before cleaning I would document the appearance of the lens when you unpacked it from the box. The sooner you do that the better so that the seller or warranty department doesn't think the spots could have been caused in your course of using the lens. If the spots are on the outside surface of the rear lens element I would try cleaning them off with a ...

The water spots could be from anything. Suggestion would be to return the lens and exchange for one which does not have any defects. All of the "water spots" I've seen on the rear lens elements of my lenses were from my own mistakes, where a tiny droplet of water (breath, mist, cleaning solution, etc) landed on the element and was left there unnoticed. Some ...