How to get rid of a smell

[Ryan T]

So, without going into a lot of graphic details lets suffice it to say that something happened and now my older brothers car has a distinct odor inside. I've cleaned it inside and out, shampooed most of the carpets, used turtle wax interior cleaner on all inside surfaces and currently have 3 air freshners sitting inside of it. However when you get in the car it still has a wiff of that odor. What further can I do? I've thought about sprinkling baking soda on the carpets and vacuuming it up? Other ideas? Thanks.