Smelly cars

We bought a 2009 for my son - cannot get the smell out. It’s in perfect condition. Interior looks beautiful, but it has this moldy smell. My husband has a 2006 and all of a sudden it’s starting to smell, but his has more of a tangy smell. We’ve had them detailed. They both look great. We’ve replaced the air filters, lots of Lysol, even let a dehumidifier run for several hours in both. What are we missing? Is there a place we can’t see that could be collecting water?