Pardon me guys, but I have an entirely different perspective on this problem.
This man owns a new and expensive automobile. Not only should he not have this problem, he shouldn't have to try to fix it.
My suggestion would be to take it to his dealer, tell them to fix the damn thing, dry out the mats, remove all moisture from the area so there will be no mildew or rust problems in the future and call when it is done. Or am I missing something here?