I agree with the recommendation that you buy your own ozone generator and let it run for a couple of hours a few times. We are snowbirds and bought one for about $75 on Amazon to use on our house up north when we return. It helps get the musty odors out, and is about the only way you might get the stink out of the air ducts. I usually place it near a return duct. Of course, you should only do it when you're going to be out of the house for a few hours...maybe playing golf.
If you can localize the source, you might want to try using "Pooph", which you can buy at Walmart or Amazon. It's mostly for odors on (or created by) pets. But, I've used it with pretty good results on stinky garbage bins. It probably wouldn't be much help if you can't find a fairly localized source.
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