How do I get rid of a moldy smell in my car carpet?

My car got flooded because of a leaky sunroof a few weeks ago. The water was removed a while ago and the carpet is dry now, but the car has a moldy smell in it. I called an auto detailer, he told me on the phone that steam cleaning it wouldn't work, and that I would need to take my car to an upholstery shop so they can remove the carpet and clean underneath it. I won't be able to take it to the shop anytime soon, but I can't have my wife in the car due to her allergies. Is there any way to DIY clean it without having to remove the carpeting?